Politician who served as the 67th Prime Minister of Portugal from December 1917 to December 1918 and as the 4th President of Portugal from April 1918 to December 1918. He was known as the "President-King".
He served in the army and taught mathematics at the army school and at the University of Coimbra.
He led an uprising against the Democratic Party and instituted an authoritarian regime in December 1917.
His children were named Sidonio, Antonio, Maria, Sidonia, Afonso, Pedro, and Maria Olga.
He is the great-grandfather of pianist and composer Bernardo Sassetti.