Saint Gregory Nazianzen is a Doctor of the Church and one of the greatest saints of the fourth century. He is called Nazianzen because he was bishop of a small town of that name in Cappadocia, in Asia Minor. His father and his mother are both listed in the calendar of the saints. He also had a brother and a sister who are saints. Saint Gregory’s great friend and companion was Saint Basil the Great. With Saint Basil he is remembered as one of the four great Eastern Doctors of the Church. He was the leading theologian and was in charge at the Second Ecumenical Council of the Church, held at Constantinople in 381. Its purpose was to defend the Divinity of the Holy Ghost, and to redefine the Divinity of Jesus.