Simeon of Thessalonica
d.1429. Greek Orthodox archbishop and theologian. Little is known of his life; his fame rests primarily on his chief work, Dialogue Against all Heresies and on the One Faith. The first part of the book was devoted to a discussion of the Trinity and Christology, while the second section dealt with the liturgy and the sacraments. The work included polemics against Jews, Bogomiles,* and Muslims, and questioned the primacy of the papacy. Simeon was willing to grant the pope considerable authority if he upheld the true faith, but since the papacy had added the word Filioque to the Creed, Simeon maintained it had forfeited its primacy. He also wrote a number of shorter works dealing with the * and doctrinal questions.