What is the origin of word champion?

The word "champion" comes from the Old English word "cempa", meaning "warrior" or "fighter". The word was originally used to refer to a person who fought on behalf of another, such as a king or a lord. Over time, the meaning of the word changed to refer to someone who was the best at something, such as a sport or a game. The word "champion" is also used to describe something that is the best in its class or field, such as a "champion car" or a "champion horse".