Cornwall). [*]Alfonso (king of Castile), (rivals). 1257 1261 Urban IV. 1265 Clement IV. 1269 Vacancy. 1271 Gregory X. [*]Rudolf I (of Hapsburg). 1272 1276 Innocent V. 1276 Hadrian V. 1277 John XX or XXI. 1277 Nicholas I 1281 Martin IV. 1285 Honorius IV. 1289 Nicholas IV. 1292 Vacancy. [*]Adolf (of Nassau). 1292 1294 Celestine V. 1294 Boniface VIII. [*]Albert I. 1298 1303 Benedict XI. 1305 Clement V. Henry VII. 1308 1314 Vacancy. Lewis IV. 1315 (Frederick of Austria, rival). 1316 John XXI or XXII. 1334 Benedict XII. 1342 Clement VI. Charles IV. 1347 1352 Innocent VI. (Günther of Schwartzburg, rival). 1362 Urban V. 1370 Gregory XI. 1378 Urban VI, Clement VII [*]Wenzel. 1378 (Anti-pope). 1389 Boniface IX. 1394 Benedict (Anti-pope). [*]Rupert. 1400 1404 Innocent VII. 1406 Gregory XII. 1409 Alexander V. 1410 John XXII or Sigismund. 1410 XXIII. (Jobst of Moravia, rival).