The Cappadocian Fathers, also traditionally known as the Three Cappadocians, are Basil the Great (330–379), who was bishop of Caesarea; Basil's younger brother Gregory of Nyssa (c.332–395), who was bishop of Nyssa; and a close friend, Gregory of Nazianzus (329–389), who became Patriarch of Constantinople. The Cappadocia region, in modern-day Turkey, was an early site of Christian activity, with several missions by Paul in this region.
The Cappadocians advanced the development of early Christian theology, for example the doctrine of the Trinity, and are highly respected as saints in both Western and Eastern churches.
The fathers set out to demonstrate that Christians could hold their own in conversations with learned Greek-speaking intellectuals and that Christian faith, while it was against many of the ideas of Plato and Aristotle (and other Greek philosophers), was an almost scientific and distinctive movement with the healing of the soul of man and his union with God at its center—one best represented by monasticism. They made major contributions to the definition of the Trinity finalized at the First Council of Constantinople in 381 and the final version of the Nicene Creed, finalised there.
They made key contributions to the doctrine of the Trinity and to the responses to Arianism and Apollinarianism.