(Ἀγάθων), at first Reader, afterwards Librarian, at Constantinople. In A. D. 680, during his Readership, he was Notary or Reporter at the 6th General Council, which condemned the Monothelite heresy. He sent copies of the acts, written by himself, to the five Patriarchates. He wrote, A. D. 712, a short treatise, still extant in Greek, on the attempts of Philippicus Bardanes (711-713) to revive the Monothelite error, Conciliorum Nova Collectio à Mansi, vol. xii. p. 189.