Ioannes 112 was bishop of Siblia in Phrygia Pacatiana; in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council) and was probably present at the last seven sessions, from 26 September to 23 November 787: Mansi XII 1107-XIII 486. His name is missing from the list of those present at the first session. In the list of those present at the seventh session he is styled Ἰωάννου ἐπισκόπου Σίβεως: Mansi XIII 372 (the Latin version, at XIII 373, calls him: "Ioanne episcopo Siblios"). Elsewhere he is styled Ἰωάννης ὁ ὁσιώτατος ἐπίσκοπος Σιβλείας or similar: Mansi XII 1107 (Latin version, at XII 1108, has: "Sibliae"), XIII 148 (Σύβεως; Latin version, at XIII 147, has: "Sybeos"), XIII 393 (Σουβλίου; Latin version, at XIII 394, has: "Sublii"). His see was apparently Siblia in Phrygia Pacatiana. 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 148. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 393.

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