Cleisthenes' reforms were a series of political changes implemented in Athens around 508-507 BCE, aimed at establishing a more democratic government by reducing the power of the aristocracy and increasing the role of ordinary citizens. These reforms introduced new political structures, such as the demes, which served as the basic unit of political organization, and the Council of Five Hundred, which allowed for greater citizen participation in governance. The significance of these changes laid the groundwork for Athenian democracy and represented a shift from tyranny to a system that emphasized popular sovereignty.
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