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.
Colonial Brazil
Due to the absence of the King and the economic independence of Brazil, Portugal entered a severe crisis that obliged João VI and the royal family to return to Portugal in 1821: a Liberal Revolution had broken out in Portugal in 1820, and the royal governors who ruled Portugal in the King's name had been replaced by a revolutionary Council of Regency formed to govern the European portion of the kingdom until the King's return. Indeed, the King's immediate return to Lisbon was one of the main demands of the Revolution. Under the revolutionary Council of Regency, a constituent assembly, known as the Portuguese Constitutional Courts ("Cortes Constitucionais Portuguesas"), was elected to abolish the absolute monarchy and replace it with a constitutional one. King João VI, then, yielding to pressure, returned to Europe. Brazilian representatives were elected to join the deliberations of the Constitutional "Cortes" of the kingdom.