His origin is obscure except that he came from the region of Eordaea.
Magas married the noblewoman Antigone, the child of Cassander and the niece of the powerful regent Antipater.
[2] His marriage to Antigone reveals that Magas was a nobleman of some social status and influence as he married a close relation to the powerful regent and his wife was a distant collateral relative to the Argead dynasty.
[3] After Magas married Antigone, they settled in Eordaea.
Antigone bore Magas a daughter, his only known child, Berenice I of Egypt.