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.
Fifth Empire
The origins of the myth of the Fifth Empire are intimately connected with the History of Portugal. The death of King Sebastian and subsequent loss of independence were disastrous for the country and its colonial ambitions. The restoration of independence in 1640 did, however, give a new hope for the entire nation. Father António Vieira, in many of his works and sermons, would present John IV as the saviour, who would restore the grandiosity of the Portuguese Empire, leader of the Age of Discovery, and succeed to the four empires of ancient History (Vieira's past empires did not coincide with those advocated by Pessoa and mentioned above). As for the Fifth Monarchists later in England and other authors, although with some differences, Vieira, with an elaborate exegesis based on his vast knowledge of the Bible, believed that the timing was significant because the calendar year 1666 was approaching. The number 666 had been identified in the Book of Revelation with the ultimate human despot to rule the world, but who would be replaced by the second coming of the Messiah; this added to his belief that the Fifth Monarchy was possibly about to begin.