 According to one version (Herodotus's "Histories", 5.4), Gorgo's grandfather Anaxandridas II was long married without children and was advised to remarry (i.e.take a second wife) which he did.His second wife gave birth to the future Cleomenes I who was thus his eldest son; however, his first wife also became pregnant, and eventually had three sons, including Leonidas I, Gorgo's future husband.