Gregory of Nazianzus (Greek: Γρηγόριος ὁ Ναζιανζηνός Grēgorios ho Nazianzēnos; c. 329–25 January 390), also known as Gregory the Theologian or Gregory Nazianzen, was a 4th-century Archbishop of Constantinople, and theologian. He is widely considered the most accomplished rhetorical stylist of the patristic age. As a classically trained orator and philosopher he infused Hellenism into the early church, establishing the paradigm of Byzantine theologians and church officials.
Gregory made a significant impact on the shape of Trinitarian theology among both Greek- and Latin-speaking theologians, and he is remembered as the "Trinitarian Theologian". Much of his theological work continues to influence modern theologians, especially in regard to the relationship among the three Persons of the Trinity. Along with the brothers Basil the Great and Gregory of Nyssa, he is known as one of the Cappadocian Fathers.
Gregory is a saint in both Eastern and Western Christianity. In the Roman Catholic Church he is numbered among the Doctors of the Church; in the Eastern Orthodox Church and the Eastern Catholic Churches he is revered as one of the Three Holy Hierarchs, along with Basil the Great and John Chrysostom.
He is also one of only three men in the life of the Orthodox Church who have been officially designated "Theologian" by epithet, the other two being St. John the Theologian (the Evangelist), and St. Symeon the New Theologian.
This St. Gregory's orations are literary jewels, with scriptural and theological depth. That they are heartfelt jumps from the page; what would it have been like to be there? Many of the subjects are situation specific (which I skipped over), but love and devotion to God shine forth throughout all of the ones I read. After the Apostle John, this Gregory is considered, in the Orthodox Church, the ultimate theologian. These orations, especially the five theological orations (the 5th is included with the 4th) show why.