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In page Maria I of Portugal:

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In February 1792, Maria was deemed insane and was treated by Francis Willis, the same physician who attended the British king George III. Willis wanted to take her to England, but the plan was refused by the Portuguese court. Potentially as a result of Willis' more advisory role in Maria's care, rather than the hands-on care of King George III, Willis deemed the queen incurable.[2] Maria's second son, Dom João (John), now Prince of Brazil, took over the government in her name, even though he only took the title of Prince Regent in 1799.[3] When the Real Barraca de Ajuda burnt down in 1794, the court was forced to move to Queluz, where the ill queen would lie in her apartments all day. Visitors would complain of terrible screams that would echo throughout the palace.[citation needed]