Her father Cleomenes was the eldest-born son of the previous Agiad king, Anaxandridas II,[1] and succeeded his father at his death; however, he had three paternal half-brothers, of whom the eldest, Dorieus, would cause him some trouble. The other two half-brothers were Leonidas I and Cleombrotus. All four were sons of Anaxandridas II, one of the dual kings of Sparta of the Agiad house.[lower-alpha 1]