The Pits were a fighting campaign created in order to entertain Cybertronians, but secretly detract them from the corruption in places, by a battle of warriors, the fight sometimes leading to ones uncertain death. Megatronus conquered the Pits of Kaon by becoming an undefeated champion, leaving every other fighter lesser than he. Later on, however, he left the Pits for the political, fighting for the freedom of the others in his caste and the equality of all. Near the beginning of the Great War, Megatron took Kaon for the capital of the Decepticons, along with his past with the Pits.
During the Battles of Decepticons and Autobots on Earth, Megatron had repeatedly mention and boasted of his accomplishments and his stature in the Pits of Kaon. Once warning both sides that a gladiator of Kaon is not one to be messed with.