The condition of the Moorish power in Spain had been particularly favourable to his early enterprises in Gallicia, for it had left him comparatively free from the fear of invasion from the south, and given him opportunities for winning signal victories. The wave of Mohammedan fanaticism, which had established the Almoravid dynasty in Spain and Morocco, and defeated the Christian chivalry at the battle of Zalaca, had lost its power, and the Almoravides had degenerated.[2] Independent Mohammedan dynasties had again established themselves in the different provinces of Spain, while in Africa, the successor of the Mahdi, Abd-el-Mumin, was destroying the power of the Almoravides with a fresh fanatical movement. The three independent emīrs with whom the Portuguese had to deal were those of the Alfaghar or Algarves, of Al-kasr Ibn Abi Danes, which comprised Badajoz, Elvas, and Evora, and of the Belatha, which included the Mohammedan possessions to the north of the Tagus with the important cities of Lisbon, Santarem, and Cintra. Under these emīrs were numerous “wālis” of districts, “vezīrs” of cities, and “kāids” of castles, who were semi-independent; and as not only the emīrs, but their subordinates were constantly at war with each other, and could expect but little help from the Almoravide caliph, the incursions of the Portuguese were generally crowned with success. After his accession to the government, Affonso Henriques had chiefly left the duty of harassing the Moors to the Knights Templars and Knights Hospitallers, who engaged in frequent expeditions from their headquarters at Soure and Thomar, where they had been established by Donna Theresa. Busied as he was with his schemes for independence, Affonso did little to assist these knightly monks, except to build a great castle at Leiria, which was intended at once to cover his capital Coimbra, and to serve as a base for expeditions against Santarem and Cintra. The erection of this castle alarmed the Mohammedans of the Belatha, and caused them for a moment to drop their quarrels with each other. They raised a large army, and in 1135, the very year in which the castle of Leiria had been built, they stormed it, killed the 240 knights who had been left as its garrison, and defeated a Christian army at Thomar. At the time of these disasters Affonso was in Gallicia, but when affairs there were temporarily settled by the Peace of Tuy, he prepared to undertake a great expedition against the Moors and gathered all the chivalry of Portugal to follow him.