Beatrice of Savoy was the daughter of Amadeus IV

Amadeus IV of Savoy

Amadeus IV was Count of Savoy from 1233 to 1253.The legitimate heir of Thomas I of Savoy and Margaret of Geneva, he had however to fight with his brothers for the inheritance of Savoy lands after their father's death...

 the Count of Savoy

Savoy

Savoy is a region of France. It comprises roughly the territory of the Western Alps situated between Lake Geneva in the north and Monaco and the Mediterranean coast in the south....

 and his second wife, Cecilia of Baux. She married Juan Manuel, Lord of Villena

Juan Manuel, Lord of Villena

Juan Manuel was the son of Ferdinand III of Castile and his wife Elisabeth of Hohenstaufen....

 the son of King Ferdinand III of Castile

Ferdinand III of Castile

Saint Ferdinand III, T.O.S.F., was the King of Castile from 1217 and León from 1230. He was the son of Alfonso IX of León and Berenguela of Castile. Through his second marriage he was also Count of Aumale. He finished the work done by his maternal grandfather Alfonso VIII and consolidated the...

. Her most notable child was Juan Manuel, Prince of Villena, that title being one he inherited from Beatrice.

She died in 1292, leaving her son an orphan

Orphan

An orphan is a child permanently bereaved of or abandoned by his or her parents. In common usage, only a child who has lost both parents is called an orphan...

 under the guardianship of her brother-in-law Sancho IV

Sancho IV of Castile

Sancho IV the Brave was the King of Castile, León and Galicia from 1284 to his death. He was the second son of Alfonso X and Yolanda, daughter of James I of Aragon.-Biography:...

.