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In 1093 the Moors of the Almoravide dynasty, under the Caliph Yusuf, swept irresistibly upwards into the Iberian Peninsula, recapturing Lisbon and Santarem in the west, and pushing their conquest as far as the river Mondego.
To meet this revival of Mohammedan power, Alfonso VI. Of Castile summoned the chivalry of Christendom to his aid. Among the knights who answered the call was Count Henry of Burgundy (grandson of Robert, first Duke of Burgundy) to whom Alfonso gave his natural daughter Theresa in marriage, together with the Counties of Oporto and Coimbra, with the title of Count of Portugal.