Reigned from March 31, 1829 to December 1, 1830. Born on November 20, 1761 in Cingoli, Italy as Francesco Xaverio Castiglione; died in Rome, Italy. He was Bishop of Monalto, and of Cesena, Cardinal-Bishop of Frascati, and grand penitentiary. During his reign the Catholic Emancipation Bill was passed in England in 1829. He published a Brief in 1830 which declared that marriage could be blessed by the Church only when the proper promises were made as regards the education of the children. He was especially versed in canon law, numismatics, and biblical literature.