Berengaria de Castilla

Berengaria de Castilla (Spanish: Berenguela de Castilla) was the mother of Ferdinand de Castilla III and the suo jour Queen of Castile. Berengaria was a member of the prominent House of Ivrea along with Beatrice of Burgundy. She married her first cousin once-removed, Alfonso de León IX, and became the Queen Consort of León, temporarily uniting the two kingdoms. Berengaria and Alfonso were forced to annul their marriage by the Roman Catholic Church on grounds of consanguinity.

Trivia

 * Berengaria was legally married to the uncle of her own son's future wife, so had Ferdinand been born to Conrad instead of Alfonso, he would have been Elisabeth's first cousin.