Alcmaeonidae ălk˝mēŏ´nĭdē [key], Athenian family powerful in the 7th, 6th, and 5th cent. BC Blamed for the murder of the followers of Cylon, the would-be tyrant (c.632 BC), they were considered attainted and were exiled. They were again in Athens in the 6th cent. The most prominent members of the family later were Cleisthenes , Pericles (whose mother was an Alcmaeonid), and Alcibiades .

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