Eustathios 47 was a Stoudite monk, mentioned in a letter of Theodoros 15 (Theodore the Stoudite), written in 809/811; he was one of the monks whom Theodoros 15 proposed to identify by means of a code letter, for security purposes: Theod. Stud., Ep. 41, pp. 121-122. In early or mid 809 he delivered a letter from Theodoros 15 to the bishop of Rome, Leo III (Leo 11), seeking his support for the Stoudite position over the Moechian controversy: Theod. Stud., Ep. 34, pp. 94-99 (δι' Εὐσταθίου τοῦ ἑταίρου αὐτοῦ, sc. of Epiphanios 48, καὶ ἡμῶν τέκνου (p. 95, lines 22-23); cf. also διὰ τοῦ ἀδελφοῦ Εὐσταθίου (p. 99, line 145)).

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