Pope Sixtus IV, born Francesco della Rovere, was Pope from 9 August 1471 to his death in 1484. His accomplishments as pope included building the Sistine Chapel and the creation of the Vatican Archives. A patron of the arts, the group of artists that he brought together introduced the Early Renaissance into Rome with the first masterpieces of the city's new artistic age. Sixtus aided the Spanish Inquisition, though he fought to prevent abuses therein, and annulled the decrees of the Council of Constance. He was famed for his nepotism and was personally involved in the infamous Pazzi conspiracy.
Upon being elected pope Della Rovere adopted the name Sixtus - a name that had not been used since the 5th century. One of his first acts was to declare a renewed crusade against the Ottoman Turks in Smyrna. However, after the conquest of Smyrna, the fleet disbanded. Some fruitless attempts were made towards unification with the Greek Church. For the remainder of his pontificate, Sixtus turned to temporal issues and dynastic considerations.
Pope Sixtus' tomb was destroyed in the Sack of Rome in 1527. Today, his remains, along with the remains of his nephew Pope Julius II (Giuliano della Rovere), are interred in St. Peter's Basilica in the floor in front of the monument to Pope Clement X. A marble tombstone marks the site.