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
The death of King John VI in 1826 led to a crisis of royal succession. His eldest son, Pedro I of Brazil, briefly became Pedro IV of Portugal, but neither the Portuguese nor the Brazilians wanted a unified monarchy; consequently, Pedro abdicated the Portuguese crown in favor of his 7-year-old daughter, Maria da Glória, on the condition that when she came of age she would marry his brother, Miguel. Dissatisfaction at Pedro's constitutional reforms led the "absolutist" faction of landowners and the church to proclaim Miguel king in February 1828. This led to the Liberal Wars in which Pedro eventually forced Miguel to abdicate and go into exile in 1834 and place his daughter on throne as Queen Maria II.