Description: (Former Head of the Catholic Church and Ruler of the Papal States)
Pope Callixtus III began his career as a law professor and later became a diplomat for the kings of Aragon. He played a crucial role in resolving conflicts, served as Bishop of Valencia, and as a cardinal in the Roman Curia, introduced the tradition of the Angelus noon bell. He supervised the retrial of Joan of Arc and appointed two nephews as cardinals, with one later becoming Pope Alexander VI. Callixtus is known for being the last pope to adopt the name "Callixtus".