St. Gregory is a name associated with several important figures in Christian history, most notably St. Gregory the Great, who was a pope in the 6th century. He is known for his contributions to the Church, including the development of the Gregorian Chant, which is a style of plainchant used in liturgical music. St. Gregory the Great is also recognized for his writings on theology and pastoral care. Another significant figure is St. Gregory of Nazianzus, a 4th-century theologian and one of the Cappadocian Fathers. He played a crucial role in the early Christian Church, particularly in the development of the doctrine of the Trinity. Both St. Gregorys are celebrated for their influence on Christian thought and practice.