diff --git a/src/claimDefinitions/index.js b/src/claimDefinitions/index.js
index dcc7b81..1d2283e 100644
--- a/src/claimDefinitions/index.js
+++ b/src/claimDefinitions/index.js
@@ -18,6 +18,7 @@ const list = [
   'irc',
   'xmpp',
   'matrix',
+  'matrix_legacy',
   'telegram',
   'twitter',
   'reddit',
@@ -41,6 +42,7 @@ const data = {
   irc: require('./irc'),
   xmpp: require('./xmpp'),
   matrix: require('./matrix'),
+  matrix_legacy: require('./matrix_legacy'),
   telegram: require('./telegram'),
   twitter: require('./twitter'),
   reddit: require('./reddit'),
diff --git a/src/claimDefinitions/matrix.js b/src/claimDefinitions/matrix.js
index 62d94aa..8b86c68 100644
--- a/src/claimDefinitions/matrix.js
+++ b/src/claimDefinitions/matrix.js
@@ -27,12 +27,12 @@ const processURI = (uri) => {
 
   const params = queryString.parse(match[2])
 
-  if (!('org.keyoxide.e' in params && 'org.keyoxide.r' in params)) {
+  if (!('org.keyoxide.r' in params)) {
     return null
   }
 
   const profileUrl = `https://matrix.to/#/@${match[1]}`
-  const eventUrl = `https://matrix.to/#/${params['org.keyoxide.r']}/${params['org.keyoxide.e']}`
+  const eventUrl = `https://matrix.to/#/${params['org.keyoxide.r']}`
 
   return {
     serviceprovider: {
@@ -41,7 +41,7 @@ const processURI = (uri) => {
     },
     match: {
       regularExpression: reURI,
-      isAmbiguous: false
+      isAmbiguous: true
     },
     profile: {
       display: `@${match[1]}`,
@@ -55,7 +55,6 @@ const processURI = (uri) => {
         access: E.ProofAccess.GRANTED,
         format: E.ProofFormat.JSON,
         data: {
-          eventId: params['org.keyoxide.e'],
           roomId: params['org.keyoxide.r']
         }
       }
@@ -63,7 +62,7 @@ const processURI = (uri) => {
     claim: {
       format: E.ClaimFormat.URI,
       relation: E.ClaimRelation.CONTAINS,
-      path: ['content', 'body']
+      path: ['chunk', 'content', 'topic']
     }
   }
 }
@@ -71,7 +70,7 @@ const processURI = (uri) => {
 const tests = [
   {
     uri:
-      'matrix:u/alice:matrix.domain.org?org.keyoxide.r=!123:domain.org&org.keyoxide.e=$123',
+      'matrix:u/alice:matrix.domain.org?org.keyoxide.r=!123:domain.org',
     shouldMatch: true
   },
   {
diff --git a/src/claimDefinitions/matrix_legacy.js b/src/claimDefinitions/matrix_legacy.js
new file mode 100644
index 0000000..c68a2f9
--- /dev/null
+++ b/src/claimDefinitions/matrix_legacy.js
@@ -0,0 +1,93 @@
+/*
+Copyright 2021 Yarmo Mackenbach
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+const E = require('../enums')
+const queryString = require('query-string')
+
+const reURI = /^matrix:u\/(?:@)?([^@:]*:[^?]*)(\?.*)?/
+
+const processURI = (uri) => {
+  const match = uri.match(reURI)
+
+  if (!match[2]) {
+    return null
+  }
+
+  const params = queryString.parse(match[2])
+
+  if (!('org.keyoxide.e' in params && 'org.keyoxide.r' in params)) {
+    return null
+  }
+
+  const profileUrl = `https://matrix.to/#/@${match[1]}`
+  const eventUrl = `https://matrix.to/#/${params['org.keyoxide.r']}/${params['org.keyoxide.e']}`
+
+  return {
+    serviceprovider: {
+      type: 'communication',
+      name: 'matrix'
+    },
+    match: {
+      regularExpression: reURI,
+      isAmbiguous: true
+    },
+    profile: {
+      display: `@${match[1]}`,
+      uri: profileUrl,
+      qr: null
+    },
+    proof: {
+      uri: eventUrl,
+      request: {
+        fetcher: E.Fetcher.MATRIX_LEGACY,
+        access: E.ProofAccess.GRANTED,
+        format: E.ProofFormat.JSON,
+        data: {
+          eventId: params['org.keyoxide.e'],
+          roomId: params['org.keyoxide.r']
+        }
+      }
+    },
+    claim: {
+      format: E.ClaimFormat.URI,
+      relation: E.ClaimRelation.CONTAINS,
+      path: ['content', 'body']
+    }
+  }
+}
+
+const tests = [
+  {
+    uri:
+      'matrix:u/alice:matrix.domain.org?org.keyoxide.r=!123:domain.org&org.keyoxide.e=$123',
+    shouldMatch: true
+  },
+  {
+    uri: 'matrix:u/alice:matrix.domain.org',
+    shouldMatch: true
+  },
+  {
+    uri: 'xmpp:alice@domain.org',
+    shouldMatch: false
+  },
+  {
+    uri: 'https://domain.org/@alice',
+    shouldMatch: false
+  }
+]
+
+exports.reURI = reURI
+exports.processURI = processURI
+exports.tests = tests
diff --git a/src/enums.js b/src/enums.js
index c2813fe..3e50c68 100644
--- a/src/enums.js
+++ b/src/enums.js
@@ -49,6 +49,8 @@ const Fetcher = {
   XMPP: 'xmpp',
   /** HTTP request to Matrix API */
   MATRIX: 'matrix',
+  /** HTTP request to Matrix API (legacy method) */
+  MATRIX_LEGACY: 'matrix_legacy',
   /** HTTP request to Telegram API */
   TELEGRAM: 'telegram',
   /** HTTP request to Twitter API */
diff --git a/src/fetcher/index.js b/src/fetcher/index.js
index df32047..cc23077 100644
--- a/src/fetcher/index.js
+++ b/src/fetcher/index.js
@@ -18,6 +18,7 @@ exports.dns = require('./dns')
 exports.http = require('./http')
 exports.irc = require('./irc')
 exports.matrix = require('./matrix')
+exports.matrix_legacy = require('./matrix_legacy')
 exports.telegram = require('./telegram')
 exports.twitter = require('./twitter')
 exports.xmpp = require('./xmpp')
diff --git a/src/fetcher/matrix.js b/src/fetcher/matrix.js
index 97a0a26..a9b4f0b 100644
--- a/src/fetcher/matrix.js
+++ b/src/fetcher/matrix.js
@@ -31,8 +31,7 @@ module.exports.timeout = 5000
  * @function
  * @async
  * @param {object} data                           - Data used in the request
- * @param {string} data.eventId                   - The identifier of the targeted post
- * @param {string} data.roomId                    - The identifier of the room containing the targeted post
+ * @param {string} data.roomId                    - The identifier of the room containing the proof
  * @param {object} opts                           - Options used to enable the request
  * @param {string} opts.claims.matrix.instance    - The server hostname on which the library can log in
  * @param {string} opts.claims.matrix.accessToken - The access token required to identify the library ({@link https://www.matrix.org/docs/guides/client-server-api|Matrix docs})
@@ -55,7 +54,10 @@ module.exports.fn = async (data, opts) => {
       throw new Error(`Matrix fetcher was not set up properly (${err.message})`)
     }
 
-    const url = `https://${opts.claims.matrix.instance}/_matrix/client/r0/rooms/${data.roomId}/event/${data.eventId}?access_token=${opts.claims.matrix.accessToken}`
+    const urlFilter = encodeURI('{"limit": 1,"types": ["m.room.topic"]}')
+    const url = `https://${opts.claims.matrix.instance}` +
+      `/_matrix/client/v3/rooms/${data.roomId}/messages` +
+      `?access_token=${opts.claims.matrix.accessToken}&dir=b&filter=${urlFilter}`
     axios.get(url,
       {
         headers: { Accept: 'application/json' }
diff --git a/src/fetcher/matrix_legacy.js b/src/fetcher/matrix_legacy.js
new file mode 100644
index 0000000..990e032
--- /dev/null
+++ b/src/fetcher/matrix_legacy.js
@@ -0,0 +1,78 @@
+/*
+Copyright 2021 Yarmo Mackenbach
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+const axios = require('axios')
+const validator = require('validator')
+
+/**
+ * @module fetcher/matrix_legacy
+ */
+
+/**
+ * The request's timeout value in milliseconds
+ * @constant {number} timeout
+ */
+module.exports.timeout = 5000
+
+/**
+ * Execute a fetch request
+ * @function
+ * @async
+ * @param {object} data                           - Data used in the request
+ * @param {string} data.eventId                   - The identifier of the targeted post
+ * @param {string} data.roomId                    - The identifier of the room containing the targeted post
+ * @param {object} opts                           - Options used to enable the request
+ * @param {string} opts.claims.matrix.instance    - The server hostname on which the library can log in
+ * @param {string} opts.claims.matrix.accessToken - The access token required to identify the library ({@link https://www.matrix.org/docs/guides/client-server-api|Matrix docs})
+ * @returns {object}
+ */
+module.exports.fn = async (data, opts) => {
+  let timeoutHandle
+  const timeoutPromise = new Promise((resolve, reject) => {
+    timeoutHandle = setTimeout(
+      () => reject(new Error('Request was timed out')),
+      data.fetcherTimeout ? data.fetcherTimeout : module.exports.timeout
+    )
+  })
+
+  const fetchPromise = new Promise((resolve, reject) => {
+    try {
+      validator.isFQDN(opts.claims.matrix.instance)
+      validator.isAscii(opts.claims.matrix.accessToken)
+    } catch (err) {
+      throw new Error(`Matrix_legacy fetcher was not set up properly (${err.message})`)
+    }
+
+    const url = `https://${opts.claims.matrix.instance}/_matrix/client/r0/rooms/${data.roomId}/event/${data.eventId}?access_token=${opts.claims.matrix.accessToken}`
+    axios.get(url,
+      {
+        headers: { Accept: 'application/json' }
+      })
+      .then(res => {
+        return res.data
+      })
+      .then((res) => {
+        resolve(res)
+      })
+      .catch((error) => {
+        reject(error)
+      })
+  })
+
+  return Promise.race([fetchPromise, timeoutPromise]).then((result) => {
+    clearTimeout(timeoutHandle)
+    return result
+  })
+}