Question: Who is the maternal grandmother of Sancha, Heiress Of León?
Sentence (from "Sancha, heiress of León"): Although in Castile it was customary for females to inherit, and Sancha's stepmother became queen, briefly, of Castile, in León female succession was barred, although her ancestor Urraca had been the first queen regnant of Western Europe.
Relevant evidence: No