It was predictably in Greece that sports were first instituted formally, with the first Olympic Games recorded in 776 BCE in Olympia, where they were celebrated until 393 CE. The games were held every four years, or Olympiad, which became a unit of time in historical chronologies. Initially a single sprinting event, the Olympics gradually expanded to include several footraces, run in the nude or in armor, boxing, wrestling, pankration, chariot racing, long jump, javelin throw, and discus throw.