Leo 48 was bishop of Sibila (Sibylla, Sibela) in Isauria; 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 999-XIII 486. In the lists of those present at the first and seventh sessions he is styled, respectively, Λεοντίου (sic) ἐπισκόπου Σιβύλλων, Mansi XII 999 (the Latin version, at XII 1000, calls him "Leone episcopo Sibyllensium"); and Λέοντος ἐπισκόπου Σιβήνων (sic), Mansi XIII 373. Elsewhere he is styled Λέων ὁ ὁσιώτατος ἐπίσκοπος Σιβίλλων or similar: Mansi XII 1110, XIII 149 (Σιβήλων), XIII 397 (Σιβίλων). On the name of his see, see Ramsay, Historical Geography, pp. 345, 369, 450. 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 1110. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 149. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 397.

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