Simplified Heracles and Perseus Genealogy
More genealogical information
Apollodorus (2.1.4) claims that Aegyptus and Danaus were twins and that their mother was Anchinoe (otherwise unknown) and that she was daughter of the river Nile. He says that it was Euripides who added Cepheus and Phineus as additional sons of Belus. Belus settled Aegyptus in Arabia and Danaus in Libya.
Apollodorus also claims that Agenor was Belus' twin brother.
According to Pherycides (3F21) Belus also had daughter named Damno who married her uncle (Belus' brother) Agenor and bore to him Phoenix and two daughters named Isaie, and Melia, these becoming wives respectively to their cousins Aegyptus and Danaus sons of Belus.
In the Eoiae (see Hesiod) 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 father of the Lamia.
A unique alternate tradition
Nonnus (Dionysiaca 3.287f) makes Belus the father of "as many as five", namely Phineus, Phoenix, Agenor (identified as the father of Cadmus), Aegyptus, and Danaus, though Nonnus elsewhere (2.686) 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. (Is the god Ba‘al Hammon of Carthage part of this mix?)
Belus and Bel Marduk
Diodorus Siculus (1.27.28) claims that Belus founded a colony on the river Euphrates and appointed the priests whom the Bablyonians call Chaldeans who like the priests of Eygypt are exempt from taxation and other service to the state and who practice astrology. Pausanias (4.23.10) in speaking of Heracles Manticulus being so called because a certain Manticlus founded a temple of Heracles for the Messenians, cites as similar cases that Zeus Ammon in Libya and Zeus Belus in Babylon are named respectively from a shepherd-founder named Ammon and from Belus son of Libya. This supposed connection between Belus of Egypt and Zeus Belus (the god Marduk) is likely to be more learned speculation than genuine tradition. Pausanias seems to know nothing of supposed connection between Belus son of Libya and Zeus Ammon that Nonnus will later put forth as presented just above.
Belus and Ba‘al
Modern writers tend to speculate on a connection between Belus and one or another god who bore the common northwest Semitic title Ba‘al.