Portuguese President Sidónio Pais is assassinated.

The president of Portugal, officially the president of the Portuguese Republic, is the head of state and highest office of Portugal.

Sidónio Bernardino Cardoso da Silva Pais nicknamed "the President-King", was the 4th president of Portugal, serving in 1918. A Portuguese politician, military officer, and diplomat he served as prime minister, minister of war and minister of foreign affairs from 1917 to 1918, minister of finance from 1911 to 1912, and minister of commerce and public works in 1911. His time in politics turned him into one of the most divisive figures in modern Portuguese history, having been referred to by writer Fernando Pessoa as the "President-King", a description that stuck in later years and symbolizes his regime. He is the only Portuguese president to have been assassinated, and the 3rd Portuguese head of state to die a violent death.