Head of the Catholic Church in 1276
Source (Wikipedia): Pope Adrian V

Pope Adrian V, born Ottobuono de’ Fieschi, was the head of the Catholic Church and ruler of the Papal States from 11 July 1276 to his death on 18 August 1276. He was an envoy of Pope Clement IV sent to England in May 1265 who successfully completed his task of resolving disputes between King Henry III of England and his barons. Adrian V was elected pope following the death of Innocent V, but died of natural illness before being ordained to the priesthood.