Sancha, heiress of León

Sancha of León was the eldest child and daughter of Alfonso IX of León by his first wife, Theresa of Portugal. She was raised at the court of their father, but her younger sister Dulce and her brother Ferdinand were raised with their mother in Portugal after the annulment of their parents' marriage in 1195. 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.