Leonidas I
Looking forward to Cleomenes' death (489 BC), his only surviving child Gorgo became his sole heiress. By 490, she was apparently already married her half-uncle Leonidas I. King Leonidas and Queen Gorgo would have at least one child, a son, Pleistarchus, co-king of Sparta from 480 BC to his death in 459 BC/458 BC.