Hilarion 8 was a monk and a priest, he was an iconophile, serving under an iconoclast bishop, Gregorios 145; Hilarion 8 and his fellow monk Eustratios 22 sent queries to Theodore the Stoudite (Theodoros 15) concerning the relations between the orthodox (i.e. supporters of the veneration of icons) and those clergy who had defected from the cause; in a letter addressed to the monk Methodios 5, written between 821 and 826, Theodoros 15 gave them his answers; they had also sent gifts to Theodoros 15, which he reciprocated: Theod. Stud., Ep. 549, pp. 831-838 (τῶν πνευματικῶν ἡμῶν ἀδελφῶν Ἱλαρίωνός τε καὶ Εὐστρατίου, p. 831, lines 8-9; also περὶ πρεσβυτέρων ὀρθοδόξων, ἤγουν Ἱλαρίωνος καὶ Εὐστρατίου μοναχοῦ, p. 838, lines 154-155).

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