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.
United Kingdom of Portugal, Brazil and the Algarves
By a provision of the Letters Patent of 13 May 1825, confirmed by the Treaty on the Recognition of Independence in spite of the secession of Brazil from the Portuguese Monarchy, the Portuguese King, John VI, was allowed to use for the remainder of his life the honorary title of "Emperor of Brazil", with the caveat that this title was honorary and ceremonial only, and that Pedro I and his successors in the independent Brazilian Crown were the only actual Emperors of Brazil. This honorary title ceased to have effect upon the demise of King John VI on 10 March 1826.