Although unofficial dialogue between individual theologians of the (Eastern) Orthodox and the Oriental Orthodox began in 1964, official dialogue did not begin until 1985; but already by 1989 an agreement was reached on the Christological dogma, stating that the word "physis" in Cyril of Alexandria's formula referred to the "hypostasis" of Christ, one of the three "hypostaseis" or "prosopa" (persons) of the Trinity, who has "become incarnate of the Holy Spirit and Blessed Virgin Mary Theotokos, and thus became man, consubstantial with us in His humanity but without sin. He is true God and true Man at the same time, perfect in his Divinity, perfect in His humanity. Because the one she bore in her womb was at the same time fully God as well as fully human we call the Blessed Virgin Theotokos. When we speak of the one composite "hypostasis" of our Lord Jesus Christ, we do not say that in Him, a divine "hypostasis" and a human "hypostasis" came together. It is that the one eternal "hypostasis" of the Second Person of the Trinity has assumed our created human nature in that act uniting it with His own uncreated divine nature, to form an inseparably and unconfusedly united real divine-human being, the natures being distinguished from each other in contemplation only."