Pope Sixtus IV (21 July 1414 – 12 August 1484), born Francesco della Rovere, was pope from 9 August 1471 to his death in 1484. His accomplishments as pope included building the Sistine Chapel; 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. He also established the Vatican Archives. Sixtus furthered the agenda of the Spanish Inquisition and annulled the decrees of the Council of Constance. He was famed for his nepotism and was personally involved in the infamous Pazzi Conspiracy.