The inclusion or exclusion of heads of states and heads of government is difficult to understand. (firstthings.com)
Over time, however, international law slowly evolved to allow the prosecution of former heads of state for certain acts, particularly war crimes and crimes against humanity. (suffolklawreview.org)
The pope, as head of state of the largest Christian religion in the world, lives at the office so to speak. (religion.blogs.cnn.com)