The Martyrdom of St. Babylas
Circa 985
Manuscript illumination
Menologion of Basil II
Vatican Library, Rome
This being a Byzantine manuscript, the saint's status as a bishop is signified by the omophorion around his neck. The onlookers are Saints Urbanus, Prilidianus, and Epolonius – boys that Babylas had been instructing in the faith and who were also beheaded.
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Source: this page at Wikimedia Commons.