 The fertile district of Elis had been reserved by agreement for Oxylus.The Heracleidae ruled in Lacedaemon until 221 BC, but disappeared much earlier in the other countries.This conquest of Peloponnesus by the Dorians, commonly called the "Return of the Heracleidae", is represented as the recovery by the descendants of Heracles of the rightful inheritance of their hero ancestor and his sons.