Frederick II, Holy Roman Emperor, 1194-1250.; Innocent III, Pope, 1160 or 1161-1216.; Honorius III, Pope, -1227.; Gregory IX, Pope, approximately 1170-1241.; Innocent IV, Pope, approximately 1200-1254.; Urban IV, Pope, approximately 1200-1264.; Alexander IV, Pope, -1261.; Eugene IV, Pope, 1383-1447, addressee.
Sixtus IV, Pope, 1414-1484.; Alexander IV, Pope, -1261.; Sassoferrato, Marco Marzio.; Urban VI, Pope, 1318-1389.; Martin V, Pope, 1368-1431.; Eugene IV, Pope, 1383-1447.; Clement VI, Pope, approximately 1291-1352.; Innocent IV, Pope, approximately 1200-1254.; Nicholas V, Pope, 1397-1455.; Estouteville, Guillaume d', approximately 1412-1483.; Boniface VIII, Pope, -1303.