Question: When did Sancho Iii Of Castile's mother die?
Sentence (from "Sancho III of Castile"): It was also in his reign that the Leonese and Castilian spheres of conquest against al-Andalus were decided in the Treaty of Sahagún (May 1158), besides an exclusion of the conquering rights and a possible division of the Portuguese kingdom among the two sons of Alfonso VII, which would come to nothing possibly due to the premature death of Sancho.
Relevant evidence: No