has taken place, which I shall call a 'sacramental union'". Thus, the main theological division in this question, turned out to be not between Catholicism and Protestantism, but within Protestantism, especially between Luther and Zwingli, who discussed the question at the Marburg Colloquy of 1529 but who failed to come to an agreement. Zwingli's view became associated with the term Memorialism, suggesting an understanding of the Eucharist held purely "in memory of" Christ. While this accurately describes the position of the Anabaptists and derived traditions, it is not the position held by Zwingli himself, who affirmed that Christ is truly (in substance), though not naturally (physically) present in the sacrament. The position of the Church of England on this matter (the real presence) is clear and highlighted in the Thirty-nine Articles of Religion: The Council of Trent, held 1545–1563 in reaction to the Protestant Reformation and initiating the Catholic Counter-Reformation, promulgated the view of the presence of Christ in the Eucharist as true, real, and substantial, and declared that, "by the consecration of the bread and of the wine, a conversion is made of the whole substance of the bread into the substance (substantia) of the body of Christ our Lord, and of the whole substance of the wine into the substance of His blood; which conversion is, by the holy Catholic Church, suitably and properly called Transubstantiation". The Scholastic, Aristotelian philosophy of substance was not included in the Council's definitive teaching, but rather the more general idea of "substance" that had predated Thomas Aquinas. Eastern Orthodoxy did not become involved in the dispute prior to the 17th century. It became virulent in 1629, when Cyril Lucaris denied the doctrine of transubstantiation, using the Greek translation metousiosis for the concept. To counter the teaching of Lucaris, Metropolitan Petro Mohyla of Kiev drew up in Latin an Orthodox Confession in defense of transubstantiation. This Confession was approved by all the Greek-speaking Patriarchs (those of Constantinople, Alexandria, Antioch, and Jerusalem) in 1643, and again by the 1672 Synod of Jerusalem (also referred to as the Council of Bethlehem). Views Catholic view The Catholic Church declares that the presence of Christ in the Eucharist is true, real, and substantial. By saying Christ is truly present in the Eucharist, it excludes any understanding of the presence as merely that of a sign or figure. By stating that his presence in the Eucharist is real,