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.
History of Portugal (1777–1834)
Portugal's neighbor Spain, during its resistance to the Napoleonic invasions, had approved a liberal Constitution when King Ferdinand VII was in exile, but it was quickly abrogated on his return, and he reigned as absolute monarch. The Spanish model also served as an example for the Portuguese: a popular uprising in the provinces against absolutism forced the Spanish monarch to reinstate the 1820 Constitutional monarchy.