Andalusia and utterly defeated Alfonso VIII. of Castile at the battle of Alarcos in 1195. King Sancho recognized the fact that the Moors, while united under their great Almohade caliph, were too powerful for him to attack, and he therefore turned his attention to the disputes among the Spanish sovereigns, and to matters of internal administration. It is fortunately not necessary to relate the history of Sancho’s wars with his Christian neighbours. The independence of Portugal was now an established fact, and the minute details of the various wars waged up to the year 1200 have no especial importance or interest, except in so far as they contribute to a knowledge of the causes of the quarrel which ensued between Sancho and the Pope. It will be remembered that the eldest daughter of Affonso Henriques, Donna Urraca, had married Ferdinand II., King of Leon, and that she was the mother of Alfonso IX. This monarch had commenced his reign on friendly terms with Affonso Henriques, and his successor Sancho, and this friendliness had culminated in 1191, in the marriage of Alfonso IX. of Leon to Sancho’s daughter, Donna Theresa. This princess, whose virtues were such that she was canonized as a saint in 1705, was thus first cousin to her husband, and as the canon law was very strict against such marriages, Pope Celestine III. by threats of excommunication and of interdict, forced her husband to repudiate her and to send her back to Portugal in 1195. This insult not only brought about the wars with Leon, which have been mentioned, but left in the mind of King Sancho a rankling animosity against the Papacy, which found its outlet later in his great quarrel with Pope Innocent III.