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In page Maria Theresa of Austria-Este, Queen of Sardinia:

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Maria Theresa became a good friend of Marie Clotilde of France, the childless consort of Charles Emmanuel, Prince of Piedmont.[citation needed] She was also close to the Duchess of Chablais.[1] At the time of her marriage, her spouse was the Duke of Aosta. As such, she was styled as Her Royal Highness the Duchess of Aosta until she became queen. The couple had six daughters and one son, who died young. Upon the invasion of Piedmont by Napoleon Bonaparte in 1798, she left with her family first to Tuscany and then to Sardinia.[2]