Athanasios 11 was the owner of a seal, of uncertain date, possibly ninth or tenth century; on one side is a monogram, interpreted as the name Ἀθανασίου; on the other is another monogram, of which no interpretation is given: Konstantopoulos, JIAN 10, 854a. Two similar seals, 854b-c, were described by Konstantopoulos as forgeries of 854a; perhaps they are other specimens struck from the same boulloterion.

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