At last the marriage of his daughter Constance with the Infante Don Pedro, son of King James of Arragon, crowned his prosperity. Concluded in defiance of the court of Rome, this marriage allied the bastard Prince of Tarento with the French royal family; for Isabella of Arragon, sister of his son-in-law Don Pedro, became the wife of Philip, son of Louis IX., and heir apparent to the crown of France. This last piece of good fortune nearly turned Mainfroy’s head. Instead of defending himself against the Holy See, he assumed the offensive, and invaded its territories. Moreover, he now openly professed, and established as a principle, that the right to dispose of the imperial diadem was not vested in the Popes, but in the senate and people of Rome. “It is time,” he added, “to put an end to this usurpation.” Such maxims, thus publicly proclaimed, rendered the Pope irreconcilable. The papal dream of annexing the Two Sicilies to the pontificate had long melted into air before the sun of Mainfroy’s arrogant prosperity; and Urban IV., convinced that the Church had need of a valiant and devoted defender, turned his eyes northwards, whilst his lips pronounced the name of Charles of Anjou. Charles, the _good_ Count of Anjou, as some of the chroniclers call him, was married to Beatrix of Savoy, Countess of Provence, whose hand he obtained in preference to two formidable rivals,—Conrad, son of the Hohenstauffe, and Pedro of Arragon. The latter we have just referred to as having subsequently married a daughter of Mainfroy. Through life Peter and Charles were destined to be rivals; and if the latter had the advantage at the outset, his competitor afterwards in some degree balanced the account by robbing him of the island of Sicily. In 1248, soon after his marriage, Charles embarked at Aiguesmortes with his brother Louis and their wives, on a crusade,—was sick to death at the island of Cyprus, but recovered, and performed prodigies of valour in fight with the Saracen. It seemed as if the scent of battle sufficed to restore him his full vigour; and he displayed a furious impetuosity and reckless daring that almost surpass belief. On arriving off Damietta, and at sight of the Saracen army waiting on the shore, he and St Louis sprang from their galley, and waded to land, with the water to their waists. Surrounded by the enemy, Charles raised a wall of corpses around him, until his knights came up to the rescue. Heading them, he charged the infidel host, ordering to strike at the horses’ breasts. The noble Arab chargers fell by hundreds; the Saracens fled; Louis and Charles pursued; Damietta was the prize of the Christians. “The adventurous prince feared the elements as little as he did man. One day the Saracens threw Greek fire upon the crusaders’ tents. Struck with surprise at sight of this mysterious enemy, the Christians were so terrified that they dared not attempt to extinguish the flames. ‘I will go,’ cried the Count of Anjou.