Theodoros 86 was bishop of Heraklion (Herakleiopolis) 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 perhaps 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 Θεοδώρου ἐπισκόπου Ἡρακλειουπόλεως: Mansi XIII 369. Elsewhere he is styled Θεόδωρος ἐπίσκοπος Ἡρακλειουπόλεως: Mansi XIII 145. He appears each time with a group of Cretan bishops; his see was probably therefore Herakleia (Heraklion) in Crete. At the fourth session he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 145. His name is missing from the list of those who subscribed the statement of the faith adopted by the Council at the seventh session, but he was present at that session and the omission is perhaps due to a defect in the text.

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