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.
Spanish Empire
In 1640, Spain had already experienced the loss of Portugal, following its revolt against Spanish rule, and brought to an end the Iberian Union, and the establishment of the House of Braganzaunder king John IV of Portugal. He had received widespread support from the Portuguese people, and Spain was unable to respond, since it was at war with France and Catalonia revolted that year. with the war against France. Spain and Portugal co-existed in a "de facto" state of peace from 1644 to 1656. When John died in 1656, the Spanish attempted to wrest Portugal from his son Alfonso VI of Portugal but were defeated at Ameixial (1663) and Montes Claros (1665), leading to Spain's recognition of Portugal's independence in 1668, during the regency of Philip IV's young heir, Charles II, who was seven at the time.