He ruled from 180C.E.-192C.E. Even though he ruled for only twelve years, he still made the Roman Empire Decline. Commodus was only intrested in entertainment than government. He held chariot races and gladiator battles. He was such a bad leader, that he allowed other people to help him run the empires. Everyone hated him, even his sister. Two people tried to assassinate him, his sister and Lucilla. They both weren't sucessful. This lead to civil war.