Lisbon Regicide
The assassination of King Carlos and the Prince Royal was the effective end of a constitutional monarchy in Portugal (later confirmed by the 5 October 1910 revolution). The regime functioned for another 33 months with growing agitation and demands for reform (although considerably less than in the future First Republic). It cannot be denied that the weak and permissive attitude in the Government of Acclamation was an incentive for the Republican Party to attempt another coup. The assassinations did not change the system of government; instead, they delayed the change.
Portugal Day
Although Camões became a symbol for Portugal nationalism, his death coincided with the Portuguese succession crisis of 1580 that eventually resulted in Philip II of Spain claiming the Portuguese throne. Portugal was then ruled by three generations of Spanish kings during the Iberian Union (1580–1640). On 1 December 1640, the country regained its independence once again by expelling the Spanish during the Portuguese Restoration War and making John of Bragança, King John IV of Portugal.