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.
Henry, King of Portugal
Cardinal Henry ( ; 31 January 1512 – 31 January 1580) was King of Portugal and the Algarves and a cardinal of the Roman Catholic Church. He ruled Portugal between 1578 and 1580 and was known as "Henry the Chaste" (Portuguese: "Henrique o Casto") and the "Cardinal-King". As a clergyman, he was bound to chastity, and as such, had no children to succeed him, and thus an end to the Royal House of Aviz. His death led to the Portuguese succession crisis of 1580 and ultimately to the 60-year Iberian Union that saw Portugal share a monarch with that of Spain. The next independent monarch of Portugal would be John IV, who took the throne after 60 years of Spanish rule.