Isabella of Castile, Queen of Aragon

Isabella of Castile
Infanta of Castille
Queen consort of Aragon, Sicily, and Majorca
Tenure	1291–1295
Duchess consort of Brittany
Tenure	1312–1328
Born	1283 Toro, Kingdom of Castile
Died	1328 Billiers
Burial	Prières Abbey
Spouse	James II of Aragon John III, Duke of Brittany
House	Castilian House of Ivrea
Father	Sancho IV of Castile
Mother	María de Molina

Isabella of Castile (1283–1328) was the Queen of Aragon as the first wife of King James II and Duchess of Brittany as the second wife of Duke John III.^[1]

Isabella was born in Toro, the eldest daughter of King Sancho IV of Castile^[2] and María de Molina. As On 1 December 1291, Isabella married King James II of Aragon in the city of Soria. The bride was only eight years old and the groom twenty-four. The marriage was never consummated.

Sancho IV died on 25 April 1295. James chose to change his alliances and take advantage of the turmoil inside Castile. He had their wedding annulled and proceeded to marry Blanche of Anjou.

Isabella remained unwed for about a decade. In 1310, at Burgos, she married her second husband, Duke John III of Brittany. There were no children from this marriage. She was buried at Prières Abbey.

• Bent, Margaret (2016). Magister Jacobus de Ispania, Author of the Speculum musicae. Routledge.

• Marek, Miroslav. "A listing of descendants of Alfonso X of Castile". Genealogy.EU.