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 in the Middle Ages
This process was essentially complete with the ascension of Afonso III of Portugal, the first to claim the title of "King of Portugal and the Algarve". The history of Portugal in the period between the death of Afonso III in 1279 and the beginning of the Portuguese Empire in 1415 includes the 1383–1385 Portuguese interregnum and the subsequent transition from the Portuguese House of Burgundy to the House of Aviz.