Confusion regarding him 259 His works at Urbino 261 Commences St. Peter's, at Rome 262 Builds at the Vatican 263 Fra Bernardo Catelani 264 Crocchia of Urbino 265 1450-1517. Francesco Francia 265 1430-1506. Andrea Mantegna 265 1424-1514. Giovanni Bellini 266 1446-1523. Pietro Perugino 266 1386-1445. Jean van Eyck 266 1474. Justus of Ghent 267 Italian portrait medallions 269 1468. Clemente of Urbino 270 Medals of Duke Federigo 270 Medal of Duchess Elisabetta 272 Medal of Emilia Pia 273 CHAPTER XXXI 1414. July 21. Birth of Sixtus IV. 277 " Origin of his family 277 1414. Omens attending his birth 278 1471. Aug. 9. His education and elevation to the papacy 278 Children of his father, and their descendants 279 His partiality to his nephews 283 Extravagance of Cardinal Pietro Riario 284 Hospitalities of Sixtus 285 His improvements in Rome 286 Scandals regarding him 287 His patronage of art 287 And of the Vatican Library 289 Portrait there of himself and nephews 289 Painted by Melozzo da Forlì 290 His brother Giovanni della Rovere 291 1474. Oct. 12. Made vicar of Sinigaglia 291 " " 28. His marriage with Princess Giovanna of Urbino 291 1475. Made Lord Prefect of Rome 291 His beneficial reign 292 His favour at the papal court 293 1474. The story of Zizim or Gem 293 " His ransom is seized by the Prefect 294 " Curious correspondence of the Sultan with Alexander VI. 295