Gregory of Nazianzen was a significant theologian and bishop in the early Christian Church, known for his articulate writings and influential sermons. Synonyms for "Gregory of Nazianzen" include St. Gregory the Theologian, Gregory Nazianzus, and Gregory of Constantinople. He is often referred to as one of the three Cappadocian Fathers, alongside his friend Basil the Great and his brother Gregory of Nyssa, due to their contributions in shaping the doctrine of the Trinity. Gregory of Nazianzen's works on the nature of Christ and the Holy Spirit continue to be studied and revered by theologians to this day, making him a major figure in Christian history.