Basilios 14 was bishop of Magnesia ad Maeandrum; 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 list of those present at the first session he is styled Βασιλείου ἐπισκόπου Μαγνησίας τῆς Μαιάνδρου: Mansi XII 995. In the list of those present at the seventh session the text reads Βασιλείου ἐπισκόπου τῆς Μενάνδου: Mansi XIII 368. Elsewhere he is styled Βασίλειος ὁ ὁσιώτατος ἐπίσκοπος Μαγνησίας τῆς Μαιάνδρου or similar: Mansi XII 1098, XIII 141. For the text at Mansi XIII 385 (where there is conflation of Basilios 10 and 14), see Basilios 10. At the second session he spoke in support of the traditional veneration of icons as described in statements from pope Hadrian I (Hadrianos 1) and condemned iconoclasts: Mansi XII 1098. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 141. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 385.

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