Pope John XII, born Octavianus, served as the head of the Roman Catholic Church from 955 to 964. He became pope at a young age, around 18, and was known for his controversial reign, which included political alliances and conflicts with powerful families in Italy. His papacy was marked by a blend of religious duties and secular power struggles. John XII's tenure was also characterized by accusations of immorality and corruption, leading to significant criticism from contemporaries. He was eventually deposed by Emperor Otto I, who sought to restore order in the church. John XII's reign ended with his death in 964, leaving a complex legacy.