CNN  —  Like the other ceremonies and traditions that accompany the advent of a new pope , his newly chosen name will be imbued with centuries of Catholic history and dissected for its many layers of meaning. Changing his name is one of the first actions the new pope takes as head of the Roman Catholic Church and can play a hugely symbolic role in setting the tone for his pontificate. It is a precedent that was set in the early Middle Ages and, while there is no doctrinal reason for a pope to