In Greek mythology, Eurysthenes (, "widely ruling") was one of the Heracleidae, a great-great-great-grandson of Heracles, and a son of Aristodemus and Argia. His twin was Procles. Together they received the land of Lacedaemon after Cresphontes, Temenus and Aristodemus defeated Tisamenus, the last Achaean king of the Peloponnesus. Eurysthenes married Lathria, daughter of Thersander, King of Kleonoe, sister of his sister-in-law Anaxandra, and was the father of his successor, Agis I, founder of the Agiad dynasty of the Kings of Sparta.