Polybius (ca. 203–120 BC, Greek Πολύβιος) was a Greek historian of the Hellenistic Period noted for his book called The Histories covering in detail the period of 220–146 BC. He is also renowned for his ideas of political balance in the government, which was later used in Montesquieu’s The Spirit of the Laws and the drafting of the United States Constitution.
Polybius is a supposed arcade game featured in an Internet urban legend. According to the story, the Tempest-style game was released to the public in 1981, and caused its players to go insane, causing them to suffer from intense stress and horrific nightmares. A short time after its release, it supposedly disappeared without a trace. No evidence for the existence of such a game has ever been discovered.