Detail of Saint Demetrius, Byzantine Mural, Saint John Chrysostom Church, Geraki (Geronthres), Greece, c.1300AD.

Saint Demetrius, Byzantine Mural, Saint John Chrysostom Church, Geraki, Greece, c.1300AD
Despotate of Morea
ΑΓΙΟΣ ΔΗΜΗΤΡΙΟΣ {Agios Dimitrios}

Source: Image 11, page 226 PDF 4 - "Geraki" in Monuments of Byzantine Settlements - Studies on the Monumental Remnants of Mediaeval Greece by N.C. Moutsopoulos & G. Dimitrokallis (in Greek)
Series Director: Prof. N.C. Moutsopoulos, Editor in Chief: Prof. I.E. Karayannopoulos.

Note the cross and 8 pointed stars on his shield, which is displayed behind him.

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