28 May 1926 coup d'état
The 28 May 1926 "coup d'état", sometimes called 28 May Revolution or, during the period of the authoritarian Estado Novo (), the National Revolution (), was a military coup of a nationalist origin, that put an end to the unstable Portuguese First Republic and initiated 48 years of authoritarian rule in Portugal. The regime that immediately resulted from the coup, the "Ditadura Nacional" (National Dictatorship), would be later refashioned into the "Estado Novo" (New State), which in turn would last until the Carnation Revolution in 1974.