Sisinnios 87 was a monk and priest living in the vicinity of Mantineion (in Boukellarion) (μοναχοῦ τινος καὶ πρεσβυτέρου Σισιννίου καλουμένου τοῖς τοῦ Μαντινέου χωρίοις ἐπιδημήσαντος); a virtuous man, he gave instruction to Anthousa 2, who modelled herself on him, and he foretold that she would found a monastery; after his death the penitents who used to visit him visited Anthousa 2 instead: Synax. Eccl. Const. 849-850 (27 July).

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