Alcibiades, an Athenian general who had been the main proponent of the disastrous Sicilian Expedition during the Peloponnesian Wars, where virtually the entire Athenian invading force of more than 50,000 soldiers and non-combatants (e.g., the rowers of the Triremes) was killed or captured and enslaved, was a student and close friend of Socrates, and his messmate during the siege of Potidaea (433–429 BC). Socrates remained Alcibiades' close friend, admirer, and mentor for about five or six years. While a masterful orator, Alcibiades has been described by at least two 20th century psychologists as exhibiting the classic features of psychopathy. During his career, Alcibiades famously defected to Sparta, Athens' arch-enemy, after being summoned to trial, then to Persia after being caught in an affair with the wife of his benefactor (the King of Sparta). He then defected back to Athens after successfully persuading the Athenians that Persia would come to their aid against Sparta (though Persia had no intention of doing so). Finally driven out of Athens after the defeat of the Battle of Notium against Sparta, Alcibiades was assassinated in Phrygia in 400 BC by his Spartan enemies.