Erastos 1 was a monk, probably a Stoudite; he was in Hellas with other monks between 821 and 823 when they received a letter from Theodoros 15 (Theodore the Stoudite) addressed to them jointly (Τοῖς ἠγαπημένοις ἀδελφοῖς Γρηγορίῳ, Ἰεζεκιήλ, Ἐράστῳ, Θεοφάνει, Ἀνίνᾳ, καὶ τοῖς λοιποῖς ἐν Ἑλλάδι); they had been scattered because of persecution; Theodoros addresses them as πατέρες καὶ ἀδελφοί (p. 617, line 6) and as ὦ τέκνα (p. 617, line 22) (suggesting that they were Stoudites); the letter perhaps alludes to the rebellion of Thomas the Slav, Thomas 7 (ἀτακτοῦντος τοῦ ὑπηκόου: p. 617, line 9): Theod. Stud., Ep. 439, pp. 617-618. Cf. Aninas 1.

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