The ancient Olympic Games were invented a long time ago, back in the VIII century BC, about 2800 years ago. They were held regularly for almost 12 centuries and then were forgotten for more than 1600 years.
There was a lot of talk about equality in Ancient Greece, but it only applied to the Hellenic Greeks. Only they were allowed to participate in the Olympic Games, and disenfranchised citizens were equated with barbarians, who were only allowed to be spectators.