History of Portugal (1834–1910)
Militant Republicans and their allies in the Carbonária were not willing to remain in the shadows of the constitutional monarchy. Between 4–5 October 1910, members of the Carbonária, republican youth, and elements of the army instigated a coup d'état against the already weak constitutional monarchy. The young king and his family, after a few miscues, escaped from the Palace in Mafra to exile in England. On the morning of 5 October 1910, the Republic was declared from the balcony of Lisbon City Hall, ending eight centuries of monarchy in Portugal.
United Kingdom of Portugal, Brazil and the Algarves
On 20 March 1816 Queen Maria I died in Rio de Janeiro. The Prince John, the Prince Regent, then became King John VI, the second monarch of the United Kingdom, retaining the numbering of Portuguese Sovereigns. After a period of mourning and several delays, the festivities of the acclamation of the new King were held in Rio de Janeiro on 6 February 1818.