Belus was the son of Poseidon and Libya; a descendant of the river god Inachus and nymph Melia. His brother was King Agenor of Phoenicia and he was married to Achiroe, the daughter of the river god Chremetes. Achiroe's sister Telephassa, was married to Agenor. With Achiroe, Belus was the father of the feuding brothers Danaus and Aegyptus, both of whom were intended to succeed him (as co-monarchs). However, as the result of a feud, Danaus fled to Greece, where he succeeded his distant cousin Gelanor to the throne of Argos. He reigned over Egypt and Libya, a land he named after his mother.