Family relations between Greek eponymous heroes almost certainly reflect political or commonly agreed ethnic relationships between the communities concerned. Pelops and his proverbially numerous descendants are investigated here from this perspective and it is argued that the creation of eponymous Pelopids was primarily due to political motivations. Pelops as one of the most remote ancestors of Sparta was used, already by the 5th century BC, to establish connections on a mythological level with those cities which became the allies of the (...) Lakedaimonians and are commonly known as the members of the Peloponnesian League. It is also suggested that after the battle of Plataea, these poleis erected a victory monument at Olympia on their own, which is commonly referred to as the “Achaean monument”. (shrink)