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.
Cartista
Following the Peninsular War, when the monarchy had remained transplanted in Brazil and continental Portugal was run by British-supported elites, pressure developed from professional classes to obtain more power, in light of their rule from abroad. Outward pressure eventually resulted in the 1820 Revolution, which established a Liberal constitution, investing power in the political structures and turning Portugal into a constitutional monarchy. King John VI of Portugal returned to the continent and supported this form of government, although during his reign there were pressures from the old elites such as the multiple attempts by his son Miguel of Portugal to overthrow the established Liberal constitution.