He therefore converted from Orthodoxy to Catholicism, made a profession of faith, and entered the Dominican Order about the time of the Western Schism.
The Dominican biographer, Jacques Échard, credits him with having taken an active part in the twentieth session of the Council of Constance (1414–18).
He took part in the Council of Ferrara-Florence, and was one of the six theologians appointed by the papal legate, Cardinal Julian Cesarini, to reply to the objections of the Greeks.
After the close of the Council, trouble arose between the Latins and Greeks in Cyprus; the latter accused the former of refusing to hold communion with them.
There are preserved in the Vatican manuscript copies of his treatise on the divine essence and operation, compiled from the commentaries of St. Thomas Aquinas, and addressed to Cardinal Bessarion also a little work in the form of a dialogue in reply to a letter of Mark of Ephesus against the rites and ceremonies of the Roman Church (Patrologia Graeca, CL, 862).