What is "dorieus"

Dorieus was a Spartan prince of the Agiad dynasty who lived in the 6th century BC.

Dorieus was the son of King Anaxandridas II and his first wife. However, long after Anaxandridas and the queen failed to produce an heir, pressure was put upon the king to set the queen aside and take a new wife. Anaxandridas refused to do this, so it was agreed that he alone could take a second wife (the Spartans did not practice polygamy, although infidelity by either partner was sometimes overlooked in order to increase the birthrate). The second wife of Anaxandridas soon gave birth to the future king Cleomenes I, the half-brother of Dorieus. Dorieus was born very shortly after. Soon a younger full brother was born, namely Leonidas, who later became king and famous as the Spartan commander at the Battle of Thermopylae. Another brother, Cleombrotus, would later become regent of Sparta. Upon the death of Anaxandridas, Cleomenes rightfully became king, but only after Dorieus unsuccessfully challenged him for the throne. Dorieus expected to prevail as the more fit man, but the law gave the throne to the older son.