Basilios 8 was bishop of Syllaion; 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 994-XIII 486. In the lists of those present at the first and seventh sessions he is styled Βασιλείου ἐπισκόπου Συλαίου (or similar): Mansi XII 994, XIII 365. Elsewhere he is styled Βασίλειος ὁ θεοφιλέστατος ἐπίσκοπος τοῦ Συλαίου or similar: Mansi XII 1094, XII 1151, XIII 137, XIII 384. 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 1094. At the third session he accepted as orthodox statements of the faith contained in letters from Tarasios 1 and the eastern patriarchs and condemned iconoclasts: Mansi XII 1151. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 137. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 384.

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