Theresa of Portugal, Queen of León

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Portuguese Royalty
House of Burgundy

Afonso Henriques (Afonso I)
Children include Infanta Mafalda Infanta Urraca, Queen of Léon Infante Sancho (future Sancho I) Infanta Teresa, Countess of Flanders and Duchess of Burgundy
Sancho I
Children include Infanta Teresa, Queen of Castile Infanta Sancha, Lady of Alenquer Infanta Constança Infante Afonso (future Afonso II) Infante Pedro, Count of Urgell Infante Fernando, Count of Flanders Infanta Branca, Lady of Guadalajara Infanta Berengária, Queen of Denmark Infanta Mafalda, Queen of Castile
Afonso II
Children include Infante Sancho (future Sancho II) Infante Afonso, Count of Boulogne (future Afonso III) Infanta Leonor, Queen of Denmark Infante Fernando, Lord of Serpa
Sancho II
Afonso III
Children include Infanta Branca, Viscountess of Huelgas Infante Dinis (future Denis I) Infante Afonso, Lord of Portalegre Infanta Maria Infanta Sancha
Denis
Children include Infanta Constança, Queen of Castile Infante Afonso (future Afonso IV)
Afonso IV
Children include Infanta Maria, Queen of Castile Infante Pedro (future Peter I) Infanta Leonor, Queen of Aragon
Peter I
Children include Infanta Maria, Marchioness of Tortosa Infante Fernando (future Ferdinand I) Infanta Beatriz, Countess of Alburquerque Infante João, Duke of Valencia de Campos Infante Dinis, Lord of Villar-Dompardo John, Grand Master of the Order of Aviz (future John I) (natural son)
Ferdinand I
Children include Infanta Beatrice, Queen of Castile and Leon (future Beatrice I of Portugal)
Beatrice (disputed queen)
Children include Infante Miguel of Castile and Portugal

Theresa of Portugal (Coimbra, October 4, 1178 – Lorvão, June 18, 1250; Portuguese pronunciation: [tɨˈɾezɐ] or [ˈtɾezɐ]), also known as Tarasia of Portugal and later as the Infanta-Rainha (Eng. Princess-Queen), was the oldest daughter of Sancho I of Portugal and Dulce of Aragon. She was also wife of Alfonso IX of Leon.

Teresa was the mother to three of Alfonso's children - two daughters and a son who died young - but when her marriage to Alfonso was declared invalid because of a discovered familial link which proved them to be cousins, she returned to her familial home of Lorvão, Portugal. There, she founded a Benedictine monastery. Soon after, she converted the monastery into a large Cistercian convent, with over 300 nuns.

In 1230, Alfonso died after having several children with a second wife, Berengaria of Castile. This second marriage was also annulled because Berengaria was Alfonso's second cousin. With two invalid spouses, there was dispute among the children as to who would inherit the throne. Theresa stepped in and allowed Ferdinand III of Castile, Berengaria's first son, to take the throne of León. After the succession battle, Theresa returned to Lorvao and finally took her convent vows after years of living as a nun. She died in the convent on June 18, 1250 of natural causes.

On December 13, 1705 Teresa was beatified by Pope Clement XI's papal bull Sollicitudo Pastoralis Offici, along with her sister Sancha of Portugal. Her Catholic feast day is June 17.

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