Sisinnios 20 was bishop of Apameia Kibotos in Pisidia; 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 998-XIII 486. In the lists of those present at the first and seventh sessions he is styled Σισιννίου ἐπισκόπου Ἀπαμείας τῆς Κιβωτοῦ: Mansi XII 998, XIII 372. Elsewhere he is styled Σισίννιος ὁ ὁσιώτατος ἐπίσκοπος Ἀπαμείας τῆς Κιβωτοῦ or similar: Mansi XII 1107, XIII 149. 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 1107. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 149. His name is not in the list of those who subscribed the statement of the faith adopted by the Council at the seventh session, but he attended the session and the omission is perhaps a textual error; see Konstantinos 58.

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