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Alcibiades, son of Clinias, from the deme of Scambonidae (/ˌælsɪˈbaɪ.ədiːz/; Greek: Ἀλκιβιάδης Κλεινίου Σκαμβωνίδης, transliterated Alkibiádēs Kleiníou Skambōnidēs; c. 450–404 BC), was a prominent Athenian statesman, orator, and general. He was the last famous member of his mother's aristocratic family, the Alcmaeonidae, which fell from prominence after the Peloponnesian War. He played a major role in the second half of that conflict as a strategic advisor, military commander, and politician.

During the course of the Peloponnesian War, Alcibiades changed his political allegiance on several occasions. In his native Athens in the early 410s BC, he advocated an aggressive foreign policy, and was a prominent proponent of the Sicilian Expedition, but fled to Sparta after his political enemies brought charges of sacrilege against him. In Sparta, he served as a strategic adviser, proposing or supervising several major campaigns against Athens. In Sparta too, however, Alcibiades soon made powerful enemies and was forced to defect to Persia. There he served as an adviser to the satrap Tissaphernes until his Athenian political allies brought about his recall. He then served as an Athenian General (Strategos) for several years, but his enemies eventually succeeded in exiling him a second time.