Peloponne'sian league Reference library
The Oxford Companion to Classical Literature (3 ed.)
...'sian league The earliest and longest-lived Greek alliance, dating from the reign of Cleomenes I (sixth century bc ) when Sparta negotiated treaties with Peloponnesian states whereby she could expect the support of all members in war if a majority vote favoured such a course, each state having one vote. Chilon , one of the Seven Sages , is credited with its creation. The term is modern; ancient authors would refer to ‘the Spartans and their allies’. The league was dissolved in 366 bc...