Who among the following was appointed the Patriarch of Constantinople?

St. Gregory of Nazianzus was appointed the Patriarch of Constantinople, holding a significant place in Christian history due to his contributions to the early Church and the establishment of the Nicene faith. His appointment was pivotal in the fourth century, particularly during the time of the Arian controversy, which challenged the relationship between God the Father and Jesus Christ.

Gregory's role as Patriarch came during a period when the Church was under considerable political and theological strain. He was essential in defending Orthodox Christian doctrine and unifying various factions within the Church. His oratory skills and theological insight earned him the title "The Theologian," and he is remembered for his powerful sermons that helped articulate the doctrine of the Trinity.

While St. Basil the Great, St. Gregory of Nyssa, and St. Athanasius were all influential figures in early Christianity and contributed significantly to theological discussions, they did not serve as Patriarch of Constantinople. Each of these individuals played vital roles in the development of Church doctrine and the response to Arianism, but St. Gregory of Nazianzus is specifically noted for his tenure in that pivotal ecclesiastical position.