A monk living in Jerusalem, Isaakios 10 was the joint-addressee with Arsenios 6 of a letter from Theodore the Stoudite (Theodoros 15) in 818 (for the date, see Fatouros, pp. 319*-320*); he and Arsenios 6 had briefly visited Constantinople once, around the start of the iconoclast persecution (under Leo V (Leo 15), in c. 815), when they had met Theodoros 15; they wrote to Theodoros 15 to explain why they were unable to travel back to the West, and Theodoros 15 replied telling them that he had already written to the patriarch (Thomas 60, of Jerusalem, Ep. 276) and the bearer of this letter (Dionysios 6) would give them information about the persecution; he and Arsenios 6 are referred to as ἡ ἁγία ὑμῶν δυάς and ὑμῖν γε τοῖς ἁγιωτάτοις πατράσιν: Theod. Stud., Ep. 279 (addressed τοῖς ἐν τῇ ἁγίᾳ πόλει μονάζουσιν Ἰσαὰκ καὶ Ἀρσενίῳ).

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