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.
Praça do Comércio
On 1 February 1908, the square was the scene of the assassination of Carlos I, the penultimate King of Portugal. On their way back from the palace of Vila Viçosa to the royal palace in Lisbon, the carriage containing Carlos I and his family passed through the Terreiro do Paço. While crossing the square, shots were fired from the crowd by at least two men: Alfredo Luís da Costa and Manuel Buiça. The king died immediately, his heir Luís Filipe was mortally wounded, and Prince Manuel was hit in the arm. The assassins were shot on the spot by members of the bodyguard and later recognized as members of the Republican Party – which two years later overthrew the Portuguese monarchy.