 Although Navarre at that time included the traditionally Castilian lands of Álava and La Rioja, Ferdinand demanded the cession only of Bureba.Over the next decade, he gradually extended his control over more of the western territory of Navarre at the expense of Sancho IV, although this was accomplished peacefully and is only detectable in the documentary record.In 1060, according to the "Historia silense", Ferdinand invaded the "taifa" of Zaragoza through the upland valley of the eastern Duero in the highlands around Soria.