When his son Sancho, who had in 1174 married Donna Dulce, daughter of Raymond Berenger, Count of Barcelona, and Petronilla, Queen of Aragon, came to years of discretion, he broke this truce; and in 1176 he made an incursion into Moorish Spain as far as the city of Seville, and brought back much booty with him. This incursion revived perpetual fighting with the Mohammedans, and for the next few years the Alemtejo once more became a great battle-ground. In 1179, in which year Pope Alexander III. affirmed the independence of Portugal by a special papal bull, the Moors were beaten back from Abrantes; in 1180, they destroyed Corruche, and in 1181 they were defeated at Evora. The greatest struggle was yet to come. In May, 1184, Yūsuf crossed the straits with the finest and best-equipped Moslem army the Almohades ever brought into Spain; and in June he laid siege for the second time to Santarem. Pestilence defended the Portuguese city, and on 4th of July, 1184, Sancho utterly defeated the fever-stricken army of the Moors in a great battle, in which Yūsuf himself was mortally wounded. A legend runs that Affonso Henriques was carried in his litter at the head of the reinforcements, that enabled Sancho to win this signal victory, which, whether he himself were present or not, formed a worthy close to the reign of the great crusader-king. During these last years of the Moorish wars, Affonso preserved all the quickness of intellect, if none of the bodily activity of his early years, and as his son Sancho was always at war, he devoted himself entirely to his last remaining daughter, Donna Theresa. The beauty of this princess was sung by the troubadours in all the courts of Europe, and her hand in marriage was eagerly sought by many suitors. In 1183, the old king at last accepted an offer for her, and she left her father and her country to marry Philip, the wealthy Count of Flanders. Poets and chroniclers agree in saying that the departure of this dear daughter broke the old king’s heart; he lived however to hear of, even if the legend be unfounded that he was not present at, the last great victory at Santarem, and he died on 6th of December of the following year, 1185, at Coimbra. He was buried in the church of the priory of Santa Cruz, in that city of which his friend S. Theotonio had been prior, and his tomb has been rightly reverenced as that of the true founder of Portuguese independence.