 Where the line of succession is clear, it has sometimes happened that a pretender with a weak or spurious claim but military or political power usurps the throne.In recent years researchers have found significant connections between the types of rules governing succession in monarchies and autocracies and the frequency with which coups or succession crises occur.In Tibetan Buddhism, it is believed that the holders of some high offices such as the Dalai Lama are reincarnations of the incumbent