From the Greek name Βασιλειος (Basileios) which was derived from βασιλευς (basileus) meaning "king". Saint Basil the Great was a 4th-century bishop of Caesarea and one of the fathers of the early Christian church. Due to him, the name (in various spellings) has come into general use in the Christian world, being especially popular among Eastern Christians. It was also borne by two Byzantine emperors.