Tisamenus or
Tissamenus , in
Greek mythology, was a son of
Orestes and
Hermione, who were first cousins twice over (their mothers were sisters and their fathers were brothers), so Tisamenus had only four great-grandparents, instead of the usual eight. Tisamenus succeeded his father to the thrones of
Argos,
Mycenae and
Sparta and was later killed in the final battle with the
Heracleidae. The latter were led by
Aristodemus,
Cresphontes,
Oxylus,
Temenus and sought to retake the
Peloponnese as their ancestral land. Following his death the victors divided his lands among them. Cresphontes became King of
Messene,
Oxylus of
Elis and Temenus of Argos. Aristodemus was killed during the final battle but his twin sons
Eurysthenes and
Procles jointly received the throne of Sparta. The historical Kings of Sparta belonged to the co-ruling houses of Agidae and Eyripontae and claimed their respective descent from the brothers.