Pantaleon 1 was bishop of Valentia in Phrygia Pacatiana; 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 Πανταλέοντος ἐπισκόπου Οὐαλεντίας or similar: Mansi XII 998 (Οὐελεντίας), XIII 372 (Λέοντος; the Latin version at XIII 371 calls him "Pantaleone episcopo Valentiae"). Elsewhere he is styled Πανταλέων ὁ ὁσιώτατος ἐπίσκοπος Οὐαλεντίας or similar: Mansi XII 1106, XIII 148, 393. At Mansi XIII 393 he is styled ἐπίσκοπος Γαλατίας and in the Latin version, at XIII 394, he is styled "episcopus Galatiae"; these are certainly textual errors for Οὐαλεντίας and "Valentiae". 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 1106. 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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