Pheidon (Ancient Greek: Φείδων) was an Argive ruler, usually dated to the first half of the 7th century BCE (perhaps reigning c. 680 – c. 660). While his dating is a matter of dispute and much of the information about him is fragmentary, he is almost always described as a powerful and expansionist ruler. He consolidated Argive control over the surrounding region of the Argolid. If the 7th-century dating is correct, then he defeated Sparta at the Battle of Hysiae in 669/8. He is also remembered for forcibly taking control of the presidency over the Olympic games (usually dated to 668 BCE) and creating or standardizing weights and measures which were then used throughout the Peloponnese and called Pheidonian after him. He may have intervened in the affairs of other Greek city-states on other occasions, and one late author claims that he died while involved in civil conflict in Corinth. He was remembered as a tyrant (Aristotle cites him as an example of a king who became a tyrant), perhaps for his demonstration of power at the Olympic festival.