Infanta Maria Theresa of Portugal
| Infanta Maria Theresa | |||||
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| Born | 24 August 1855 Löwenstein Castle, Kleinheubach, Kingdom of Bavaria | ||||
| Died | 12 February 1944 (aged 88) Vienna, Austria, Nazi Germany | ||||
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| House | Braganza | ||||
| Father | Miguel I of Portugal | ||||
| Mother | Adelaide of Löwenstein | ||||
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Infanta Maria Theresa of Portugal (Portuguese: Dona Maria Teresa da Imaculada Conceição Fernanda Eulália Leopoldina Adelaide Isabel Carolina Micaela Rafaela Gabriela Francisca de Assis e de Paula Gonzaga Inês Sofia Bartolomea dos Anjos de Bragança; 24 August 1855 – 12 February 1944) was a Princess of the House of Braganza. She became by marriage an Archduchess of Austria and also sister-in-law of Emperors Franz Joseph I of Austria and Maximilian I of Mexico, as well as step-grandmother of Emperor Charles I of Austria.