Leo 55 was bishop of Phoinix in Crete; in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council) and is attested at the fourth and seventh sessions, on 1 October and 13 October 787; he probably attended the last five sessions, from 1 October to 23 November 787: Mansi XIII 145-486. In the list of those present at the seventh session he is styled Λέοντος ἐπισκόπου Φοίνηκος: Mansi XIII 369. Elsewhere he is styled Λέων ἐπίσκοπος Φοίνικος or similar: Mansi XIII 145, XIII 392 (ἐπίσκοπος τοῦ Φοινικίου). At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 145. At the seventh session he subscribed the statement of the faith adopted by the Council: Mansi XIII 392. He always appears among a group of bishops from Crete.

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