Very conservative, she was an ally of her younger brother Miguel I of Portugal in his attempts to obtain the throne of Portugal (civil war 1826–1834), and of her brother-in-law and uncle Infante Don Carlos, Count of Molina in his attempts to obtain the Spanish throne. In the last years of the reign of her uncle Ferdinand VII of Spain (died 1833), Teresa lived in Madrid and plotted to strengthen Don Carlos' position in succession. She participated in the First Carlist War (1833–1839), being a leading supporter of Carlism, church and reactionary interests. Her sister Francisca, Titular Queen of Spain, wife of Carlos, died in 1834.
Spanish succession
On 15 January 1837, the Cortes of Spain legislated her excluded from the Spanish succession, rights belonging to her in descent from her mother, on grounds of her being a rebel along with Don Carlos. Her son Sebastian's rights were similarly excluded, but he was later, in 1859, restored in Spain. Also don Carlos' sons and Teresa's brother Miguel I of Portugal were excluded at the same law.
The next year she married again, in 1838, to her brother-in-law, uncle and longtime ally, Infante Carlos of Spain (1788–1855), whom she viewed as the rightful king of Spain; the widower of her sister Maria Francisca. The second marriage remained childless, but she took care of her stepsons, who were also her nephews and cousins.
They soon left Spain because of unsuccess in the civil war, and never returned. She died in Trieste on 17 January 1874, having survived her second husband by nineteen years.
^ abcAlbano da Silveira Pinto (1883). "Serenissima Casa de Bragança". Resenha das Familias Titulares e Grandes des Portugal (in Portuguese). Lisbon. p. xxxi.{{cite book}}: CS1 maint: location missing publisher (link)
La Princesa de Beira y los Hijos de Don Carlos by Conde de Rodezno (1938)
* also an infanta of Spain and an archduchess of Austria,** also an imperial princess of Brazil,*** also a princess of Saxe-Coburg and Gotha, Duchess in Saxony,◙ Also a princess of Braganza,ƒ title of pretense
Generations indicate descent from Afonso, Duke of Braganza, founder of the House of Braganza, until João II, Duke of Braganza, the first Braganza monarch of Portugal; italics indicate a head of the House
Generations indicate descent from John IV, King of Portugal, formerly John II, Duke of Braganza, the first Braganza monarch of Portugal, until Manuel II, King of Portugal, the last monarch of Portugal, excluding the Miguelist line; italics indicate a head of the House
Dame Grand Cross of the Order of the Immaculate Conception of Vila Viçosa[1]
Dame of the Order of Queen Saint Isabel[1]
Dame of the Order of Queen Maria Luisa[1]
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