St. Gregory of Nazianzus!

Gregory of Nazianzus 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 of Nazianzus is a saint in both Eastern and Western Christianity. In the 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 considered one of the Great Fathers in both Eastern and Western Christianity. He was considered the patron saint of Kotromanić dynasty and medieval Bosnia during the first half of the 15th century, while Saint George, the miracle-worker, has been the patron saint since at least mid-13th century, although confirmed by the papacy much later in 1461. St. Gregory the Great was also considered the patron of both, the state and dynasty in the late 15th century.
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 John the Theologian (the Evangelist), and Symeon the New Theologian.
Gregory was born to Greek parents in the family estate of Karbala outside the village of Arianzus, near Nazianzus, in southwest Cappadocia. : 18 His parents, Gregory and Nonna, were wealthy land-owners. In AD 325 Nonna converted her husband, a Hypsistarian, to Christianity; he was subsequently ordained as bishop of Nazianzus in 328 or 329. : vii The young Gregory and his brother, Caesarius, first studied at home with their uncle Amphylokhios. Gregory went on to study advanced rhetoric and philosophy in Nazianzus, Caesarea, Alexandria, and Athens. On the way to Athens his ship encountered a violent storm, and the terrified Gregory prayed to Christ that if He would deliver him, he would dedicate his life to His service. 28 While at Athens, he developed a close friendship with his fellow student Basil of Caesarea, and also made the acquaintance of Flavius Claudius Julianus, who would later become the emperor known as Julian the Apostate. 19, 25 In Athens, Gregory studied under the famous rhetoricians Himerius and Proaeresius. He may have been baptized there, or shortly after his return to Cappadocia.
The Eastern Orthodox Church and the Eastern Catholic Churches celebrate two feast days in Gregory's honor. 25 January is his primary feast; 30 January, known as the feast of the Three Great Hierarchs, commemorates him along with John Chrysostom and Basil of Caesarea. The Catholic Church observes his feast day on 2 January. The Church of England and the US Episcopal Church celebrate St. Gregory's Holy Day, on 2 January, a "Lesser Festival". The Lutheran Church–Missouri Synod commemorates Gregory, along with Basil the Great and Gregory of Nyssa (the Cappadocian Fathers) on 10 January. and the Evangelical Lutheran Church in America commemorates Gregory of Nazianzus together with his friends Basil the Great and Gregory of Nyssa on 14 June. The Armenian Apostolic Church devotes two days each year to Gregory. He is commemorated together with eleven other doctors of the Church on the Saturday before the feast of the Discovery of the Holy Cross (which is observed on the Sunday closest to October 26.[41] The Armenian Church calendar also has a feast day dedicated solely to Gregory. This falls either on the Saturday before the fourth Sunday of the Transfiguration, or if that day falls during the feast of the Assumption, on the Saturday before the third Sunday after the Nativity.