Patr. of Constantinople from 610 and exponent of Monothelitism. In an attempt to reconcile the Monophysites with the adherents of Chalcedonian orthodoxy, he began to teach that there were two natures in Christ but only one ‘activity’ (ἐνέργεια). On being opposed by St Sophronius of Jerusalem, he issued the ‘Psephos’ (633), which forbade mention of either one or two ‘activities’ in Christ. He also appealed to Pope Honorius I, and together they agreed that there was only one ‘will’ in Christ. This doctrine was promulgated by Heraclius I in the ‘Ecthesis’, written by Sergius (638). The ‘Acathistus’ has sometimes been ascribed to him.
Subjects: Medieval and Renaissance History (500 to 1500) — Christianity.