Sidónio Bernardino Cardoso da Silva Pais (Portuguese pronunciation: [siˈdɔniu ˈpajʃ]; 1 May 1872, in Caminha – 14 December 1918, in Lisbon) was a Portuguese military leader politician and diplomat, the fourth President in 1918. He was known as the President-King. On 5 December 1917, he led an uprising against Afonso Costa's Democratic Party government, and established an authoritarian regime and was elected President (unopposed) on 28 April 1918.