We present a theory that addresses the question of why autocracies with a regime legitimation which ties the destiny of the members of the ruling elite, namely the nobility or ideocratic elite, to the survival of the autocracy, namely (ruling) monarchies and communist ideocracies, are more durable than other kinds of autocracies. Using logistic regression analysis and event history analysis on a dataset on autocratic regimes in the period 1946 to 2009, we are able to show that ruling monarchies and communist ideocracies are indeed the most durable autocratic regime types.