Nicephorus I, Patriarch of Constantinople, Letter to Theodosios of Corinth (PG 100.1061A-1064D), inc. Περὶ ὧν ἠρώτησας τίμιε πάτερ οὐκ ἔστιν ἡμέτερον ἀποκρίνεσθαι.
Extract from Nicephorus I, Patriarch of Constantinople, Letter to Theodosios of Corinth, inc. Τὸ λύειν καὶ δεσμεύειν. Printed in Latin in PG 100.1065D-1068B.