Cleis·the·nes 1 (klīs'thə-nēz') Greek tyrant of Sicyon who led the Ionian population of the region in a revolt against the Dorians.
Cleis·the·nes 2 (klīs'thə-nēz') Athenian statesman who enacted the legal reforms of Solon, replaced the older family-based political organization with one based on locality, and is generally regarded as the founder of Athenian democracy.