Peter of Sebaste was a 4th-century bishop from the Byzantine Empire who served the city of Sebaste in Lesser Armenia. Born into the prominent Cappadocian family, he was the brother of Basil of Caesarea and Gregory of Nyssa. While his siblings were renowned for their literary achievements, Peter was noted for his practical intellect and devotion to asceticism. He played a significant role in the monastic movements of his time, eventually succeeding his brother Basil as the leader of a male monastic community.