Joseph Willibrord Mähler's 1804-5 portrait of Beethoven.
<bdi><a href="https://en.wikipedia.org/wiki/en:Joseph_Willibrord_M%C3%A4hler" class="extiw" title="w:en:Joseph Willibrord Mähler"><span title="German painter (1778-1860)">Joseph Willibrord Mähler</span></a>
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between 1804 and 1805 <div style="display: none;">date QS:P571,+1804-00-00T00:00:00Z/8,P1319,+1804-00-00T00:00:00Z/9,P1326,+1805-00-00T00:00:00Z/9</div>
Book: Beethoven: a documentary study.  Compiled and edited by H. C. Robbins Landon. New York : Macmillan, 1970.