Anonymus 622 was a monk, probably from the Stoudite monastery (τῆς ταπεινῆς ἡμῶν ποίμνης), who fled to the monastery of which Ignatios 21 was the hegoumenos; Theodoros 15 (Theodore the Stoudite) wrote to Ignatios 21 demanding his return or his expulsion; Anonymus 622 is referred to as ὁ δεῖνα ὁ ἀδελφός: Theod. Stud., Ep. 14. The letter was written after 798/799, cf. Fatouros, p. 155*.

(Publishable link for this person: )