Seal of Michael, <a href="https://en.wikipedia.org/wiki/Metropolitan_of_Athens" class="extiw" title="en:Metropolitan of Athens">Metropolitan of Athens</a>, likely of <a href="https://en.wikipedia.org/wiki/Michael_Choniates" class="extiw" title="en:Michael Choniates">Michael Choniates</a>.
Original designs: unknown Byzantine artists. Modern sketches: Gustave Schlumberger (1844-1929)
late 12th/early 13th century
Gustave Schlumberger, <i>Sigillographie de l'Empire byzantin</i> (1884)