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
After issuing a new Constitution for Portugal on 29 April 1826, and as already announced in that Constitution, Emperor-King Pedro abdicated the Portuguese Crown in favour of his daughter, Princess Maria da Glória, on 2 May 1826. Princess Maria da Glória thus became Queen Maria II of Portugal. The document by which the Brazilian Emperor abdicated the Portuguese Crown was signed days before the first meeting of the Parliament established by the Brazilian Constitution of 1824, that assembled for the first time on 6 May 1826. Before his abdication, on 26 April, King Pedro confirmed the Regency of Portugal that had been established by his father during his final illness, and that was led by the Infanta Isabel Maria, his sister. As the new Queen Maria II was still a minor, Portugal would need to be led by Regents during her minority. On 30 April, King Pedro IV set the date for the first legislative elections under the new Portuguese Constitution and appointed Peers of the Realm.