A History of the Papacy from the Great Schism to the Sack of Rome is a seminal six-volume historical work by British scholar and Anglican bishop Mandell Creighton. It provides a comprehensive account of the Catholic Church's most tumultuous centuries, spanning from 1378 to 1527. Volume IV of Mandell Creighton’s A History of the Papacy from the Great Schism to the Sack of Rome covers the turbulent transition of the papacy into a secular Italian principality from 1464 to 1494. It explores the reigns of Paul II, Sixtus IV, and Innocent VII.