Thomas 11 was a monk of the monastery of Chenolakkos; in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council) as representative of the hegoumenos of the monastery, Ioannes 127; he is attested at the fourth session, on 1 October 787, where he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 152 (Θωμᾶς μοναχὸς, καὶ ἐκ προσώπου Ἰωάννου ἡγουμένου τοῦ Χηνολάκκου). Ioannes 127 attended the same session. At the fourth session also Thomas produced a copy of the works of Asterios (Asterios of Amaseia) from which a section on St Euphemia was read out: Mansi XIII 16 (Θωμᾶς ὁ εὐλαβέστατος μοναχὸς μονῆς τοῦ Χηνολάκκου).

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