All this time Demaratus son of Ariston remained at Sparta [22.4417,37.0667] (Perseus) Sparta and spread evil reports of Cleomenes. This Demaratus was also king of Sparta [22.4417,37.0667] (Perseus) Sparta, but of the inferior house; not indeed inferior in any other regard (for they have a common ancestor), but the house of Eurysthenes has in some sort the greater honor by right of primogeniture.“The most probable origin of this anomaly” (the dual kingship) “is the fusion of two distinct communities whose chiefs shared the throne.” How and Wells, p. 82.