Theresa of Portugal, Duchess of Burgundy

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

Infanta Theresa of Portugal (Portuguese pronunciation: [tɨˈɾezɐ] or [ˈtɾezɐ]) was a Portuguese infanta (princess), being the third daughter of Portuguese 1st King Afonso Henriques and Maud of Savoy. She was born c. 1157 and died in 1218 in Veurne, Flanders.

Around 1183 she married Philip of Alsace, Count of Flanders, becoming Countess consort of Flanders. Because of the difficulty of pronouncing her name, she changed it to Matilde (Matilda or Mahaut).

Her marriage was celebrated (in the Tournai Cathedral, Bruges) after the death of Elisabeth of Vermandois, first wife of Philip, who hadn't given him any children, and was because Philip needed an heir so that his county wouldn't fall into French hands. For its part, Portugal, a new-born country, managed to secure an important alliance with Flanders, and European recognition. Theresa brought a considerable dowry, something that helped Philip manage his war with France for a couple of more years, before making peace in 1186. A reasonable number of Portuguese immigrants (mainly merchants) also went to Flanders with the infanta.

Matilda lived in one of the most luxurious royal courts of Europe, in which Philip patronized Chrétien de Troyes, author of a famous cycle of Arthurian stories and one of the fathers of the Graal theme in literature.

However, like Elisabeth of Vermandois, Matilda never gave birth, and after Philip's death, the county went to his sister Margaret I, Countess of Flanders.

After Philip's death in August 1191, she would marry again, this time to Odo III, Duke of Burgundy, in 1193. She interceded favourably with the king of France, for the marriage of her nephew Infante Ferdinand of Portugal with her grand-niece Jeanne, Countess of Flanders. Her second marriage produced no children, and so, she ended up being repudiated by the Duke, so that he could marry Alice of Vergy.

She has been reported to be Afonso I of Portugal's favourite daughter. In a work by Portuguese historian Maria Roma, she is described as beautiful and as a "prideful woman with a vyril energy", of the fibre of her grandmother Teresa, Countess of Portugal.

She is tenderly celebrated in Bruges every year.

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