 Complete the following phrase:  Leonidas was heir to the Agiad throne and a full citizen homoios at the time of the Battle of Sepeia against Argos c. 494 BC. Likewise, he was a full citizen when the Persians sought submission from Sparta and met with vehement rejection in or around 492491 BC. His elder half-brother, king Cleomenes, had already been deposed on grounds of purported insanity, and had fled into exile when Athens sought assistance against the 