Theodoros 99 was a monk, perhaps of the monastery of the Hagia Theotokos of Kaloketa; in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council) as representative of the hegoumenos of the monastery, Theodotos 7, and is attested at the fourth session, on 1 October 787, when he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 153 (Θεόδωρος μοναχὸς καὶ ἐκ προσώπου Θεοδότου ἡγουμένου τῆς ἁγίας Θεοτόκου Καλοκετῶν; the Latin version, at XIII 154, calls him "Theodorus monachus et ex persona hegumeni sanctae Dei genitricis Calocetensium"). He probably attended other sessions of the Council also; see Gregorios 45.

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