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 III of Mandell Creighton's A History of the Papacy from the Great Schism to the Sack of Rome traces the 15th-century power struggle between church reformers and papal absolutism, culminating in the reign and failed crusade of Renaissance humanist Pope Pius I.