The earlier, dated 26 March 1071, is a charter issued by Sancho to the monastery of San Pedro de Cardeña.
[1] The occasion of this charter was a meeting of Sancho with his brother, King Alfonso VI of León, and his sisters Elvira and Urraca along with the higher clergy of his kingdom in Burgos, probably to discuss the misrule of their brother, King García II of Galicia.
Her foreign origins would have allowed him to remain outside of the network of aristocratic kin groups and aloof from their disputes.
Other reports state that William's daughter was Agatha and that the contestants were Alfonso and Duke Robert Guiscard.
[6] Although not a significant figure in the legend of El Cid, Doña Alberta plays an important role in the three-act play La jura en Santa Gadea (1845) by Juan Eugenio Hartzenbusch, in which El Cid is held to have killed Ramiro.