Ioannes 537 was illoustrios; owner of a seal dateable to the sixth or seventh century; he perhaps also had the name "Plagiotes": Speck, Bleisiegel 165. Obv.: [+] Ιωα - ννου - Πλαγι - ωτου. Rev.: +ιλ - λου - στρ - ιου. The text reads: Ἰωάννου πλαγιώτου ἰλλουστρίου. The meaning of πλαγιώτου is uncertain.

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