Belus was the son of Poseidon and Libya. Maybe he is also Busiris, son of Libya, ruler of Egypt, killed by Hercules, although Hercules was born many generations after Belus since he was a grandchild of Perseus; see Argive genealogy below (Belus is also connected with Hercules; according to Pausanias, Belus founded a temple of Hercules in Babylon).
The Bibliotheca also claims that Agenor was Belus' twin brother. Belus ruled in Egypt, and Agenor ruled over Sidon and Tyre in Phoenicia.
The wife of Belus has been named as Achiroe, allegedly daughter of the river-god Nilus. Her sons Aegyptus and Danaus were twins. Later Aegyptus ruled over Egypt and Arabia, and Danaus ruled over Libya. Pseudo-Apollodorus says that it was Euripides who added Cepheus and Phineus as additional sons of Belus.
According to Pherecydes, Belus also had a daughter named Damno who married Agenor (Belus' brother, her uncle) and bore to him Phoenix and two daughters named Isaie, and Melia, these becoming wives respectively to sons of Belus (their cousins) Aegyptus and Danaus. Yet another source says that the daughter of Belus who married Agenor was named Antiope.
In the Hesiodic Catalogue of Women, Belus was also the father of a daughter named Thronia on whom Hermaon, that is Hermes, fathered Arabus, presumably the eponym of Arabia.
Some sources make Belus the father of Lamia.
Nonnus makes Belus the father of five sons, namely Phineus, Phoenix, Agenor (identified as the father of Cadmus), Aegyptus, and Danaus, though Nonnus elsewhere makes Phineus to be Cadmus' brother. Nonnus has Cadmus identify Belus as "the Libyan Zeus" and refer to the "new voice of Zeus Asbystes", meaning the oracle of Zeus Ammon at Asbystes.
Read more about this topic: Belus (Egyptian)