Prokopios 20 was a monk and a close associate of the hegoumenos Basilios 130, whose exile, imprisonment and beatings he shared during the persecution under Leo V (Leo 15); in a letter to Basilios 130, Theodoros 15 (Theodore the Stoudite) sent greetings to Prokopios 20 (τὸν ἀδελφόν μου, τὸν κῦριν Προκόπιον, πλεῖστε πρόσειπε): Theod. Stud., Ep. 389 (a. 817/818). He is alluded to but not by name in another letter of Theodoros 15 to Basilios 130: Theod. Stud., Ep. 317 (a. 816/818; ἡ δυὰς ὑμῶν, i.e. Basilios 130 and Prokopios 20).

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