Pope John XII (Latin: Ioannes XII; c. 930/937 – 14 May 964) was head of the Catholic Church from 16 December 955 to his death in 964. He was related to the Counts of Tusculum and a member of the powerful Roman family of Theophylact which had dominated papal politics for over half a century. His pontificate became infamous for the alleged depravity and worldliness with which he conducted it.