A coup d'état, often abbreviated to coup, is the overthrow of a lawful government through illegal means. If force or violence are not involved, such an event is sometimes called a soft or bloodless coup. In another variation, a ruler who came to power through legal means may try to stay in power through illegal means, thus preventing the next legal ruler from taking power. These events are called self coups. This is a chronological list of such coups and coup attempts, from ancient times to the present.