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Portugal: Polity Style: 1815-2024

before 16 Dec 1815 Reino de Portugal [1]
16 Dec 1815 - 26 Feb 1821 Reino Unido de Portugal, e do Brasil, e Algarves
26 Feb 1821 - 3 Jun 1823 Reino-Unido de Portugal, Brasil e Algarve
3 Jun 1823 - 13 May 1825 Reino Unido de Portugal, e do Brasil, e Algarves
13 May 1825 - 31 Jul 1826 Reinos de Portugal e Algarves
31 Jul 1826 - 4 Apr 1838 Reino de Portugal [2][3]
4 Apr 1838 - 10 Feb 1842 Nação Portuguesa
10 Feb 1842 - 5 Oct 1910 Reino de Portugal [2]
5 Oct 1910 - República Portuguesa [4]

[1] Also in formal use: Reino de Portugal e Algarves, with occasional grammatical variations.
[2] This style is prescribed by the Carta Constitucional, but the polity is there described thus: O seu Território forma o Reino de Portugal e Algarves ...
[3] Despite re-establishment, 10 Sep 1836, of the Constitution of 1822, the polity style remains tacitly unaltered.
[4] 19 Jan 1919 - 13 Feb 1919 Reino de Portugal (in dissidence)