Theophilos 10 was bishop of Anastasiopolis in Galatia Prima; in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council) and was probably present at all eight sessions, from 24 September to 23 November 787: Mansi XII 995-XIII 486. In the lists of those present at the first and seventh sessions he is styled Θεοφίλου ἐπισκόπου Ἀναστασιουπόλεως: Mansi XII 995, XIII 368. Elsewhere he is styled Θεόφιλος ὁ ὁσιώτατος ἐπίσκοπος Ἀναστασιουπόλεως or similar: Mansi XII 1099 (wrongly called Συνέσιος, a repetition of the name of the preceding bishop, Synesios 1), XIII 144, XIII 388. At the second session he supported the traditional veneration of icons as described in statements from pope Hadrian I (Hadrianos 1) and condemned iconoclasts: Mansi XII 1099. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 144. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 388. For his see, formerly called Lagania, cf. Ramsay, Historical Geography, p. 241, 244.

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