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Since Alfonso stated at that time his intentions to proceed to Toledo and examine its defenses we can infer that he had as yet not traveled south of Segovia but was engaged in a general oversight of repairing defenses and restoring his authority in the long , threatened eastern triangle between Madrid , Toledo and Zorita , perhaps even stretching northward toward Medinaceli . Bachrach , " The Angevin Strategy of Castle Building , " p. 542 , argues that thirty-five to forty kilometers a day is the limit for mounted troops . Those of the party who were mounted , and could make twice that speed unhindered , were free to hunt the fields and woods which teemed with game and the skies filled with birds . Yet the infant must have been a lusty one for shortly after he did in fact attain his first birthday the king had decided to take the first step toward proclaiming young Sancho as his heir .