Sicily was the most civilized place in Europe, now that Southern France had been crushed by the Albigensian persecution. The old Greek stock kept some trace of their inheritance; the Arabs had brought their culture; the Normans had added chivalric ideas; the Crusades and commerce had enlarged the intellectual boundaries; and Frederick himself had extraordinary versatility. Mathematicians from Granada, philosophers from Alexandria, were as welcome as the troubadours from Provence. Frederick looked after his own royal estates, managed his stud farm in Apulia, decided when brood mares should be fed on barley and when kept to grass. He was a great sportsman, too, and wrote a book on falconry. He enacted a famous code of laws, far superior in many respects to existing legislation, which was conceived with the definite plan of exalting royal authority over feudal prerogatives and communal customs. He deprived the barons of criminal jurisdiction; forbade private war, carrying weapons, etc; he limited trial by ordeal so far as he could, calling it "a species of divination;" he made minute regulations in matters of business and behaviour, and maintained a paternal authority. In fact, Sicily, with its culture, poetry, Moslems, and its unorthodox king, succeeded to the heretical position of Southern France. The Papacy felt instinctively that a civilization so happy in the good things of this world, so lax on many points of morality, so careless of the Roman ecclesiastical system, was a perpetual menace to it. In the nature of things, the peace that had been made with Frederick could not last long. The breach happened in the North. The Lombard cities revolted. Frederick marched against them and won a victory (1237). Then was the zenith of his power; his very triumph was the cause of his undoing. All the Guelfs of Italy roused themselves for the struggle. The Pope took part, and a second time excommunicated Frederick, enumerating a score of sins. A later Pope held a council at Lyons (a place of safety), excommunicated Frederick again, and deposed him from his Imperial throne (1245). Then an anti-emperor was set up. Blow on blow fell upon Frederick. He was terribly routed at Parma, through carelessness. His gallant son Enzio, the poet, was captured by the Bolognese, who would not release him, though Frederick offered to put a rim of gold round the walls of their city. Enzio spent twenty-three years in prison and there died. Pier della Vigna, who "kept both the keys of Frederick's heart," was suspected of high treason and condemned to death. Frederick himself died in 1250, and the Pope shouted for joy at the news, "Be glad ye Heavens, and let the Earth rejoice!" He had good reason, for the Church had lost its most dangerous enemy.