The First Portuguese Republic (; officially: "República Portuguesa", Portuguese Republic) spans a complex 16-year period in the history of Portugal, between the end of the period of constitutional monarchy marked by the 5 October 1910 revolution and the 28 May 1926 "coup d'état". The latter movement instituted a military dictatorship known as "Ditadura Nacional" (national dictatorship) that would be followed by the corporatist "Estado Novo" (new state) regime of António de Oliveira Salazar.