on at Lyons with the ambassadors of the new German king. Rudolf, in entering upon his government, renewed all the concessions made by Otto IV. and Frederick II., renounced all imperial claims upon Rome and the States of the Church, with the exception of the possessions of Matilda, and abandoned all pretension to Sicily. The pope on his part acknowledged him as king of the Romans and undertook to crown him emperor in Rome, where this agreement was to be formally ratified and signed. But Gregory died before arrangements had been completed. § 96.22. The three following popes, Innocent V., Hadrian V., and John XXI., died soon after one another. The last named, previously known as Petrus [Peter] Hispanus, had distinguished himself by his medical and philosophical writings. He was properly the twentieth Pope John, but as there was a slight element of uncertainty (§ 82, 6) he designated himself the twenty-first. After a six months’ vacancy =Nicholas III.=, A.D. 1277-1280, mounted the papal throne. By diplomacy he secured the ratification of the still undecided concordat with the German kingdom, and Rudolf, who had enough to do in Germany, immediately withdrew from Italian affairs, even abandoning his claims to imperial coronation. The powerful pope, whose pontificate was marked by rapacity and nepotism, and who is therefore put by Dante in hell, did not live long enough to carry out his plans for the overthrow of the French yoke in Italy. But he obliged Charles I. to resign his Roman senatorship, and secretly encouraged a conspiracy of the Sicilians, which under his successor =Martin IV.=, A.D. 1281-1285, a Frenchman and a pliable tool of Charles, broke out in the terrible “Sicilian Vespers” of A.D. 1282. The island of Sicily was thereby rent from the French rule and papal vassalage, and in a roundabout way the Hohenstaufens by the female line regained the government of this part of their old inheritance (§ 95, 1). Rome now again in A.D. 1284 shook off the senatorial rule which Charles I. had meanwhile again assumed, and after his death and that of Martin, which speedily followed, they transferred this dignity to the new pope =Honorius IV.=, A.D. 1285-1287, whose short but vigorous reign was followed by a vacancy of eleven months. The Franciscan general then mounted the papal throne as =Nicholas IV.=, A.D. 1288-1292. He filled up the period of his pontificate with vain endeavours to revive the spirit of the crusades and secure the suppression of heresy. Violent party feuds of cardinals of the Orsini and Colonna factions delayed the election of a pope after his death for two years. They united at last in electing the most unfit conceivable, Peter of Murrone (§ 98, 2), who, as =Cœlestine V.= changed the monk’s cowl for the papal tiara, but was persuaded after four months by the sly and ambitious Cardinal Cajetan to resign.