[Illustration: CONVENTO DE CHRISTO AT THOMAR. (_After a Photograph._)]
Sancho I., the Povoador or City-builder, had already won his reputation as a warrior in his father's life-time, and his fame as king rests rather on the success of his internal administration of his country. But before he had time to gratify his inclination towards the more peaceful duties of government, he had to continue the life and death struggle with the Moors. The great victory won the year before his accession, gave him a little breathing space, and in 1188 he even proposed to take part in the Third Crusade, for which great preparations were being made all over Europe. But the Moors were not likely to forget their repulse at Santarem, and in the same year Ya'k[=u]b, the son of Y[=u]suf, the new Almohade caliph landed in the peninsula, and marched without a check until he was once more driven from before Santarem by the conjoined influence of pestilence and of the courage of the Portuguese knights. In the following year King Sancho took his revenge; he stopped at Lisbon first an army of Dutch, Frisian, and Danish crusaders; then a body of French crusaders under Jacques d'Avesnes, Bishop of Beauvais, and the Count of Bar; and finally a well-equipped force of Londoners, all on their way to the Holy Land--and with their help he not only reduced the whole of the Alemtejo, but even took Silves, the capital of the distant emirate of the Alfaghar or Algarves. Ya'k[=u]b was astounded at these successes. He collected a large Mohammedan army, and again crossed to Spain. But ill-luck followed his advance; his army was badly equipped, and not well supplied with provisions; he was foiled by one hundred young London crusaders in an attack on Silves; he was driven back from Thomar, the headquarters of the Knights Templars, by their Grand Master in Portugal, Gualdim Paes; and was finally obliged to abandon the siege of Santarem by a pestilence, which the Portuguese ascribed to a visitation from God. But the great Almohade caliph determined to be more successful the next time; he spent two years in Africa in preaching the Holy War against the Christians, and in 1192 crossed to the peninsula with the finest Mohammedan army which had appeared there since the days of the Almoravides. King Sancho and his Portuguese knights had to oppose this formidable invasion unaided, for the crusaders had gone on their way to Palestine, and were there fighting under Richard Coeur de Lion, and Philip Augustus of France. The Mohammedan soldiers advanced in a triumphal march; they easily reconquered Silves and the Algarves, and then swept across the Alemtejo, taking in rapid succession Beja, Alcacer do Sal, the hard-won conquest of Affonso Henriques, and even Palmella and Almada--the cities which guarded the approach to Lisbon from the south. Sancho, seeing that resistance was of no avail, was only too glad to be permitted to make a treaty with the Moors, which fixed the Tagus as his southern boundary, and the vast Mohammedan army turned into Andalusia and utterly defeated Alfonso VIII. of Castile at the battle of Alarcos in 1195.