Leopold III came to the throne in 1934 after his father, Albert I, died in a mountaineering accident. Albert, known as the "Knight King" (roi-chevalier or koning-ridder), had been hugely popular in Belgium after commanding the Belgian army during World War I (1914–18) while much of the country was under German occupation. Leopold's reign was marked by economic crisis in the wake of the Great Depression, and political agitation by both far-left and far-right parties.