diff --git a/lib/matrix_api/model/event_types.dart b/lib/matrix_api/model/event_types.dart
index f08927a7..fbd4c655 100644
--- a/lib/matrix_api/model/event_types.dart
+++ b/lib/matrix_api/model/event_types.dart
@@ -31,7 +31,7 @@ abstract class EventTypes {
   static const String RoomPinnedEvents = 'm.room.pinned_events';
   static const String RoomTopic = 'm.room.topic';
   static const String RoomAvatar = 'm.room.avatar';
-  static const String RoomTombstone = 'm.room.tombsone';
+  static const String RoomTombstone = 'm.room.tombstone';
   static const String GuestAccess = 'm.room.guest_access';
   static const String HistoryVisibility = 'm.room.history_visibility';
   static const String Encryption = 'm.room.encryption';
diff --git a/lib/src/event.dart b/lib/src/event.dart
index f588970e..752074d2 100644
--- a/lib/src/event.dart
+++ b/lib/src/event.dart
@@ -22,13 +22,13 @@ import 'dart:typed_data';
 import 'package:http/http.dart' as http;
 import 'package:matrix_file_e2ee/matrix_file_e2ee.dart';
 
-import '../encryption.dart';
 import '../famedlysdk.dart';
 import '../matrix_api.dart';
 import 'database/database.dart' show DbRoomState, DbEvent;
 import 'room.dart';
 import 'utils/matrix_localizations.dart';
 import 'utils/receipt.dart';
+import 'utils/event_localizations.dart';
 
 abstract class RelationshipTypes {
   static const String Reply = 'm.in_reply_to';
@@ -46,6 +46,8 @@ class Event extends MatrixEvent {
   @Deprecated('Use [type] instead')
   String get typeKey => type;
 
+  String get senderName => sender.calcDisplayname();
+
   /// The room this event belongs to. May be null.
   final Room room;
 
@@ -450,6 +452,10 @@ class Event extends MatrixEvent {
     return MatrixFile(bytes: uint8list, name: body);
   }
 
+  /// Returns if this is a known event type.
+  bool get isEventTypeKnown =>
+      EventLocalizations.localizationsMap.containsKey(type);
+
   /// Returns a localized String representation of this event. For a
   /// room list you may find [withSenderNamePrefix] useful. Set [hideReply] to
   /// crop all lines starting with '>'.
@@ -458,210 +464,10 @@ class Event extends MatrixEvent {
     if (redacted) {
       return i18n.removedBy(redactedBecause.sender.calcDisplayname());
     }
-    var localizedBody = body;
-    final senderName = sender.calcDisplayname();
-    switch (type) {
-      case EventTypes.Sticker:
-        localizedBody = i18n.sentASticker(senderName);
-        break;
-      case EventTypes.Redaction:
-        localizedBody = i18n.redactedAnEvent(senderName);
-        break;
-      case EventTypes.RoomAliases:
-        localizedBody = i18n.changedTheRoomAliases(senderName);
-        break;
-      case EventTypes.RoomCanonicalAlias:
-        localizedBody = i18n.changedTheRoomInvitationLink(senderName);
-        break;
-      case EventTypes.RoomCreate:
-        localizedBody = i18n.createdTheChat(senderName);
-        break;
-      case EventTypes.RoomTombstone:
-        localizedBody = i18n.roomHasBeenUpgraded;
-        break;
-      case EventTypes.RoomJoinRules:
-        var joinRules = JoinRules.values.firstWhere(
-            (r) =>
-                r.toString().replaceAll('JoinRules.', '') ==
-                content['join_rule'],
-            orElse: () => null);
-        if (joinRules == null) {
-          localizedBody = i18n.changedTheJoinRules(senderName);
-        } else {
-          localizedBody = i18n.changedTheJoinRulesTo(
-              senderName, joinRules.getLocalizedString(i18n));
-        }
-        break;
-      case EventTypes.RoomMember:
-        var text = 'Failed to parse member event';
-        final targetName = stateKeyUser.calcDisplayname();
-        // Has the membership changed?
-        final newMembership = content['membership'] ?? '';
-        final oldMembership =
-            prevContent != null ? prevContent['membership'] ?? '' : '';
-        if (newMembership != oldMembership) {
-          if (oldMembership == 'invite' && newMembership == 'join') {
-            text = i18n.acceptedTheInvitation(targetName);
-          } else if (oldMembership == 'invite' && newMembership == 'leave') {
-            if (stateKey == senderId) {
-              text = i18n.rejectedTheInvitation(targetName);
-            } else {
-              text = i18n.hasWithdrawnTheInvitationFor(senderName, targetName);
-            }
-          } else if (oldMembership == 'leave' && newMembership == 'join') {
-            text = i18n.joinedTheChat(targetName);
-          } else if (oldMembership == 'join' && newMembership == 'ban') {
-            text = i18n.kickedAndBanned(senderName, targetName);
-          } else if (oldMembership == 'join' &&
-              newMembership == 'leave' &&
-              stateKey != senderId) {
-            text = i18n.kicked(senderName, targetName);
-          } else if (oldMembership == 'join' &&
-              newMembership == 'leave' &&
-              stateKey == senderId) {
-            text = i18n.userLeftTheChat(targetName);
-          } else if (oldMembership == 'invite' && newMembership == 'ban') {
-            text = i18n.bannedUser(senderName, targetName);
-          } else if (oldMembership == 'leave' && newMembership == 'ban') {
-            text = i18n.bannedUser(senderName, targetName);
-          } else if (oldMembership == 'ban' && newMembership == 'leave') {
-            text = i18n.unbannedUser(senderName, targetName);
-          } else if (newMembership == 'invite') {
-            text = i18n.invitedUser(senderName, targetName);
-          } else if (newMembership == 'join') {
-            text = i18n.joinedTheChat(targetName);
-          }
-        } else if (newMembership == 'join') {
-          final newAvatar = content['avatar_url'] ?? '';
-          final oldAvatar =
-              prevContent != null ? prevContent['avatar_url'] ?? '' : '';
-
-          final newDisplayname = content['displayname'] ?? '';
-          final oldDisplayname =
-              prevContent != null ? prevContent['displayname'] ?? '' : '';
-
-          // Has the user avatar changed?
-          if (newAvatar != oldAvatar) {
-            text = i18n.changedTheProfileAvatar(targetName);
-          }
-          // Has the user avatar changed?
-          else if (newDisplayname != oldDisplayname) {
-            text = i18n.changedTheDisplaynameTo(targetName, newDisplayname);
-          }
-        }
-        localizedBody = text;
-        break;
-      case EventTypes.RoomPowerLevels:
-        localizedBody = i18n.changedTheChatPermissions(senderName);
-        break;
-      case EventTypes.RoomName:
-        localizedBody = i18n.changedTheChatNameTo(senderName, content['name']);
-        break;
-      case EventTypes.RoomTopic:
-        localizedBody =
-            i18n.changedTheChatDescriptionTo(senderName, content['topic']);
-        break;
-      case EventTypes.RoomAvatar:
-        localizedBody = i18n.changedTheChatAvatar(senderName);
-        break;
-      case EventTypes.GuestAccess:
-        var guestAccess = GuestAccess.values.firstWhere(
-            (r) =>
-                r.toString().replaceAll('GuestAccess.', '') ==
-                content['guest_access'],
-            orElse: () => null);
-        if (guestAccess == null) {
-          localizedBody = i18n.changedTheGuestAccessRules(senderName);
-        } else {
-          localizedBody = i18n.changedTheGuestAccessRulesTo(
-              senderName, guestAccess.getLocalizedString(i18n));
-        }
-        break;
-      case EventTypes.HistoryVisibility:
-        var historyVisibility = HistoryVisibility.values.firstWhere(
-            (r) =>
-                r.toString().replaceAll('HistoryVisibility.', '') ==
-                content['history_visibility'],
-            orElse: () => null);
-        if (historyVisibility == null) {
-          localizedBody = i18n.changedTheHistoryVisibility(senderName);
-        } else {
-          localizedBody = i18n.changedTheHistoryVisibilityTo(
-              senderName, historyVisibility.getLocalizedString(i18n));
-        }
-        break;
-      case EventTypes.Encryption:
-        localizedBody = i18n.activatedEndToEndEncryption(senderName);
-        if (!room.client.encryptionEnabled) {
-          localizedBody += '. ' + i18n.needPantalaimonWarning;
-        }
-        break;
-      case EventTypes.CallAnswer:
-        localizedBody = i18n.answeredTheCall(senderName);
-        break;
-      case EventTypes.CallHangup:
-        localizedBody = i18n.endedTheCall(senderName);
-        break;
-      case EventTypes.CallInvite:
-        localizedBody = i18n.startedACall(senderName);
-        break;
-      case EventTypes.CallCandidates:
-        localizedBody = i18n.sentCallInformations(senderName);
-        break;
-      case EventTypes.Encrypted:
-      case EventTypes.Message:
-        switch (messageType) {
-          case MessageTypes.Image:
-            localizedBody = i18n.sentAPicture(senderName);
-            break;
-          case MessageTypes.File:
-            localizedBody = i18n.sentAFile(senderName);
-            break;
-          case MessageTypes.Audio:
-            localizedBody = i18n.sentAnAudio(senderName);
-            break;
-          case MessageTypes.Video:
-            localizedBody = i18n.sentAVideo(senderName);
-            break;
-          case MessageTypes.Location:
-            localizedBody = i18n.sharedTheLocation(senderName);
-            break;
-          case MessageTypes.Sticker:
-            localizedBody = i18n.sentASticker(senderName);
-            break;
-          case MessageTypes.Emote:
-            localizedBody = '* $body';
-            break;
-          case MessageTypes.BadEncrypted:
-            String errorText;
-            switch (body) {
-              case DecryptError.CHANNEL_CORRUPTED:
-                errorText = i18n.channelCorruptedDecryptError + '.';
-                break;
-              case DecryptError.NOT_ENABLED:
-                errorText = i18n.encryptionNotEnabled + '.';
-                break;
-              case DecryptError.UNKNOWN_ALGORITHM:
-                errorText = i18n.unknownEncryptionAlgorithm + '.';
-                break;
-              case DecryptError.UNKNOWN_SESSION:
-                errorText = i18n.noPermission + '.';
-                break;
-              default:
-                errorText = body;
-                break;
-            }
-            localizedBody = i18n.couldNotDecryptMessage(errorText);
-            break;
-          case MessageTypes.Text:
-          case MessageTypes.Notice:
-          case MessageTypes.None:
-            localizedBody = body;
-            break;
-        }
-        break;
-      default:
-        localizedBody = i18n.unknownEvent(type);
+    final callback = EventLocalizations.localizationsMap[type];
+    var localizedBody = i18n.unknownEvent(type);
+    if (callback != null) {
+      localizedBody = callback(this, i18n);
     }
 
     // Hide reply fallback
diff --git a/lib/src/utils/event_localizations.dart b/lib/src/utils/event_localizations.dart
new file mode 100644
index 00000000..7f607d25
--- /dev/null
+++ b/lib/src/utils/event_localizations.dart
@@ -0,0 +1,215 @@
+/*
+ *   Famedly Matrix SDK
+ *   Copyright (C) 2019, 2020 Famedly GmbH
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU Affero General Public License as
+ *   published by the Free Software Foundation, either version 3 of the
+ *   License, or (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU Affero General Public License for more details.
+ *
+ *   You should have received a copy of the GNU Affero General Public License
+ *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import '../../matrix_api.dart';
+import '../../encryption.dart';
+import '../event.dart';
+import '../room.dart';
+import 'matrix_localizations.dart';
+
+abstract class EventLocalizations {
+  static String _localizedBodyNormalMessage(
+      Event event, MatrixLocalizations i18n) {
+    switch (event.messageType) {
+      case MessageTypes.Image:
+        return i18n.sentAPicture(event.senderName);
+      case MessageTypes.File:
+        return i18n.sentAFile(event.senderName);
+      case MessageTypes.Audio:
+        return i18n.sentAnAudio(event.senderName);
+      case MessageTypes.Video:
+        return i18n.sentAVideo(event.senderName);
+      case MessageTypes.Location:
+        return i18n.sharedTheLocation(event.senderName);
+      case MessageTypes.Sticker:
+        return i18n.sentASticker(event.senderName);
+      case MessageTypes.Emote:
+        return '* ${event.body}';
+      case MessageTypes.BadEncrypted:
+        String errorText;
+        switch (event.body) {
+          case DecryptError.CHANNEL_CORRUPTED:
+            errorText = i18n.channelCorruptedDecryptError + '.';
+            break;
+          case DecryptError.NOT_ENABLED:
+            errorText = i18n.encryptionNotEnabled + '.';
+            break;
+          case DecryptError.UNKNOWN_ALGORITHM:
+            errorText = i18n.unknownEncryptionAlgorithm + '.';
+            break;
+          case DecryptError.UNKNOWN_SESSION:
+            errorText = i18n.noPermission + '.';
+            break;
+          default:
+            errorText = event.body;
+            break;
+        }
+        return i18n.couldNotDecryptMessage(errorText);
+      case MessageTypes.Text:
+      case MessageTypes.Notice:
+      case MessageTypes.None:
+      default:
+        return event.body;
+    }
+  }
+
+  // This map holds how to localize event types, and thus which event types exist.
+  // If an event exists but it does not have a localized body, set its callback to null
+  static final Map<String,
+          String Function(Event event, MatrixLocalizations i18n)>
+      localizationsMap = {
+    EventTypes.Sticker: (event, i18n) => i18n.sentASticker(event.senderName),
+    EventTypes.Redaction: (event, i18n) =>
+        i18n.redactedAnEvent(event.senderName),
+    EventTypes.RoomAliases: (event, i18n) =>
+        i18n.changedTheRoomAliases(event.senderName),
+    EventTypes.RoomCanonicalAlias: (event, i18n) =>
+        i18n.changedTheRoomInvitationLink(event.senderName),
+    EventTypes.RoomCreate: (event, i18n) =>
+        i18n.createdTheChat(event.senderName),
+    EventTypes.RoomTombstone: (event, i18n) => i18n.roomHasBeenUpgraded,
+    EventTypes.RoomJoinRules: (event, i18n) {
+      var joinRules = JoinRules.values.firstWhere(
+          (r) =>
+              r.toString().replaceAll('JoinRules.', '') ==
+              event.content['join_rule'],
+          orElse: () => null);
+      if (joinRules == null) {
+        return i18n.changedTheJoinRules(event.senderName);
+      } else {
+        return i18n.changedTheJoinRulesTo(
+            event.senderName, joinRules.getLocalizedString(i18n));
+      }
+    },
+    EventTypes.RoomMember: (event, i18n) {
+      var text = 'Failed to parse member event';
+      final targetName = event.stateKeyUser.calcDisplayname();
+      // Has the membership changed?
+      final newMembership = event.content['membership'] ?? '';
+      final oldMembership = event.prevContent != null
+          ? event.prevContent['membership'] ?? ''
+          : '';
+      if (newMembership != oldMembership) {
+        if (oldMembership == 'invite' && newMembership == 'join') {
+          text = i18n.acceptedTheInvitation(targetName);
+        } else if (oldMembership == 'invite' && newMembership == 'leave') {
+          if (event.stateKey == event.senderId) {
+            text = i18n.rejectedTheInvitation(targetName);
+          } else {
+            text =
+                i18n.hasWithdrawnTheInvitationFor(event.senderName, targetName);
+          }
+        } else if (oldMembership == 'leave' && newMembership == 'join') {
+          text = i18n.joinedTheChat(targetName);
+        } else if (oldMembership == 'join' && newMembership == 'ban') {
+          text = i18n.kickedAndBanned(event.senderName, targetName);
+        } else if (oldMembership == 'join' &&
+            newMembership == 'leave' &&
+            event.stateKey != event.senderId) {
+          text = i18n.kicked(event.senderName, targetName);
+        } else if (oldMembership == 'join' &&
+            newMembership == 'leave' &&
+            event.stateKey == event.senderId) {
+          text = i18n.userLeftTheChat(targetName);
+        } else if (oldMembership == 'invite' && newMembership == 'ban') {
+          text = i18n.bannedUser(event.senderName, targetName);
+        } else if (oldMembership == 'leave' && newMembership == 'ban') {
+          text = i18n.bannedUser(event.senderName, targetName);
+        } else if (oldMembership == 'ban' && newMembership == 'leave') {
+          text = i18n.unbannedUser(event.senderName, targetName);
+        } else if (newMembership == 'invite') {
+          text = i18n.invitedUser(event.senderName, targetName);
+        } else if (newMembership == 'join') {
+          text = i18n.joinedTheChat(targetName);
+        }
+      } else if (newMembership == 'join') {
+        final newAvatar = event.content['avatar_url'] ?? '';
+        final oldAvatar = event.prevContent != null
+            ? event.prevContent['avatar_url'] ?? ''
+            : '';
+
+        final newDisplayname = event.content['displayname'] ?? '';
+        final oldDisplayname = event.prevContent != null
+            ? event.prevContent['displayname'] ?? ''
+            : '';
+
+        // Has the user avatar changed?
+        if (newAvatar != oldAvatar) {
+          text = i18n.changedTheProfileAvatar(targetName);
+        }
+        // Has the user avatar changed?
+        else if (newDisplayname != oldDisplayname) {
+          text = i18n.changedTheDisplaynameTo(targetName, newDisplayname);
+        }
+      }
+      return text;
+    },
+    EventTypes.RoomPowerLevels: (event, i18n) =>
+        i18n.changedTheChatPermissions(event.senderName),
+    EventTypes.RoomName: (event, i18n) =>
+        i18n.changedTheChatNameTo(event.senderName, event.content['name']),
+    EventTypes.RoomTopic: (event, i18n) => i18n.changedTheChatDescriptionTo(
+        event.senderName, event.content['topic']),
+    EventTypes.RoomAvatar: (event, i18n) =>
+        i18n.changedTheChatAvatar(event.senderName),
+    EventTypes.GuestAccess: (event, i18n) {
+      var guestAccess = GuestAccess.values.firstWhere(
+          (r) =>
+              r.toString().replaceAll('GuestAccess.', '') ==
+              event.content['guest_access'],
+          orElse: () => null);
+      if (guestAccess == null) {
+        return i18n.changedTheGuestAccessRules(event.senderName);
+      } else {
+        return i18n.changedTheGuestAccessRulesTo(
+            event.senderName, guestAccess.getLocalizedString(i18n));
+      }
+    },
+    EventTypes.HistoryVisibility: (event, i18n) {
+      var historyVisibility = HistoryVisibility.values.firstWhere(
+          (r) =>
+              r.toString().replaceAll('HistoryVisibility.', '') ==
+              event.content['history_visibility'],
+          orElse: () => null);
+      if (historyVisibility == null) {
+        return i18n.changedTheHistoryVisibility(event.senderName);
+      } else {
+        return i18n.changedTheHistoryVisibilityTo(
+            event.senderName, historyVisibility.getLocalizedString(i18n));
+      }
+    },
+    EventTypes.Encryption: (event, i18n) {
+      var localizedBody = i18n.activatedEndToEndEncryption(event.senderName);
+      if (!event.room.client.encryptionEnabled) {
+        localizedBody += '. ' + i18n.needPantalaimonWarning;
+      }
+      return localizedBody;
+    },
+    EventTypes.CallAnswer: (event, i18n) =>
+        i18n.answeredTheCall(event.senderName),
+    EventTypes.CallHangup: (event, i18n) => i18n.endedTheCall(event.senderName),
+    EventTypes.CallInvite: (event, i18n) => i18n.startedACall(event.senderName),
+    EventTypes.CallCandidates: (event, i18n) =>
+        i18n.sentCallInformations(event.senderName),
+    EventTypes.Encrypted: (event, i18n) =>
+        _localizedBodyNormalMessage(event, i18n),
+    EventTypes.Message: (event, i18n) =>
+        _localizedBodyNormalMessage(event, i18n),
+    EventTypes.Reaction: null,
+  };
+}
diff --git a/test/event_test.dart b/test/event_test.dart
index 71583f63..1fafc567 100644
--- a/test/event_test.dart
+++ b/test/event_test.dart
@@ -325,7 +325,7 @@ void main() {
     test('canRedact', () async {
       expect(event.canRedact, true);
     });
-    test('getLocalizedBody', () async {
+    test('getLocalizedBody, isEventKnown', () async {
       final matrix = Client('testclient', httpClient: FakeMatrixApi());
       final room = Room(id: '!1234:example.com', client: matrix);
       var event = Event.fromJson({
@@ -355,6 +355,7 @@ void main() {
         }
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {
@@ -382,6 +383,7 @@ void main() {
         'unsigned': {'age': 1234}
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {'reason': 'Spamming'},
@@ -394,6 +396,7 @@ void main() {
         'unsigned': {'age': 1234}
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {
@@ -408,6 +411,7 @@ void main() {
         'unsigned': {'age': 1234}
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {
@@ -422,6 +426,7 @@ void main() {
         'unsigned': {'age': 1234}
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {'alias': '#somewhere:localhost'},
@@ -434,6 +439,7 @@ void main() {
         'unsigned': {'age': 1234}
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {
@@ -454,6 +460,7 @@ void main() {
         'unsigned': {'age': 1234}
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {
@@ -469,6 +476,7 @@ void main() {
         'unsigned': {'age': 1234}
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {'join_rule': 'public'},
@@ -481,6 +489,7 @@ void main() {
         'unsigned': {'age': 1234}
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {
@@ -497,6 +506,7 @@ void main() {
         'unsigned': {'age': 1234}
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {'membership': 'invite'},
@@ -508,6 +518,7 @@ void main() {
         'type': 'm.room.member'
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {'membership': 'leave'},
@@ -522,6 +533,7 @@ void main() {
         }
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {'membership': 'ban'},
@@ -536,6 +548,7 @@ void main() {
         }
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {'membership': 'join'},
@@ -550,6 +563,7 @@ void main() {
         }
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {'membership': 'invite'},
@@ -564,6 +578,7 @@ void main() {
         }
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {'membership': 'leave'},
@@ -578,6 +593,7 @@ void main() {
         }
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {'membership': 'leave'},
@@ -592,6 +608,7 @@ void main() {
         }
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {
@@ -615,6 +632,7 @@ void main() {
         'unsigned': {'age': 1234}
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {'name': 'The room name'},
@@ -627,6 +645,7 @@ void main() {
         'unsigned': {'age': 1234}
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {'topic': 'A room topic'},
@@ -639,6 +658,7 @@ void main() {
         'unsigned': {'age': 1234}
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {
@@ -654,6 +674,7 @@ void main() {
         'unsigned': {'age': 1234}
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {'history_visibility': 'shared'},
@@ -666,6 +687,7 @@ void main() {
         'unsigned': {'age': 1234}
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {
@@ -683,6 +705,7 @@ void main() {
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()),
           'Example activatedEndToEndEncryption. needPantalaimonWarning');
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {
@@ -700,6 +723,7 @@ void main() {
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()),
           'This is an example text message');
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {
@@ -717,6 +741,7 @@ void main() {
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()),
           '* thinks this is an example emote');
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {
@@ -734,6 +759,7 @@ void main() {
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()),
           'This is an example notice');
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {
@@ -750,6 +776,7 @@ void main() {
         'unsigned': {'age': 1234}
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {
@@ -767,6 +794,7 @@ void main() {
         'unsigned': {'age': 1234}
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {
@@ -787,6 +815,7 @@ void main() {
         'unsigned': {'age': 1234}
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {
@@ -811,6 +840,7 @@ void main() {
         'unsigned': {'age': 1234}
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
 
       event = Event.fromJson({
         'content': {
@@ -840,6 +870,19 @@ void main() {
         'unsigned': {'age': 1234}
       }, room);
       expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, true);
+
+      event = Event.fromJson({
+        'content': {'beep': 'boop'},
+        'event_id': '\$143273582443PhrSn:example.org',
+        'origin_server_ts': 1432735824653,
+        'room_id': '!jEsUZKDJdhlrceRyVU:example.org',
+        'sender': '@example:example.org',
+        'type': 'unknown.event.type',
+        'unsigned': {'age': 1234}
+      }, room);
+      expect(event.getLocalizedBody(FakeMatrixLocalizations()), null);
+      expect(event.isEventTypeKnown, false);
     });
 
     test('aggregations', () {