Cleon first came to notice as an opponent of Pericles in the late 430s BC through his opposition to Pericles' strategy of refusing battle against the Peloponnesian League invaders in 431 BC. As a result, he found himself acting in concert with the Athenian aristocratic parties, who stood against the "leaders of the demos", which included Isagoras, Miltiades, Thucydides, Nicias, Theramenes, and Pericles. During 430 BC, after the unsuccessful expedition by Pericles to the Peloponnesus, and when the city was devastated by the plague, Cleon headed the opposition to Pericles' rule. At this time, Pericles was accused by Cleon of maladministration of public money, with the result of Pericles being found guilty and removed from office. However, Pericles' setback was temporary and he was soon reinstated.