Franz Joseph Hermann Michael Maria von Papen, Erbsälzer zu Werl und Neuwerk (ˈfʁants fɔn ˈpaːpn̩; 29 October 1879 2 May 1969) was a German conservative politician, diplomat, Prussian nobleman and General Staff officer. He served as the chancellor of Germany in 1932, and then as the vice-chancellor under Adolf Hitler from 1933 to 1934. Born into a wealthy family of Westphalian Catholic aristocrats, Papen served in the Prussian Army from 1898 onward and was trained as a German General Staff officer. He served as military attaché in Mexico and the United States from 1913 to 1915, while also covertly organising acts of sabotage in the United States and quietly backing and financing Mexican forces in the Mexican Revolution on behalf of German military intelligence. After being expelled as persona non grata by the United States State Department in 1915, he served as a battalion commander on the Western Front of World War I and finished his war service in the Middle Eastern theatre as a lieutenant colonel. Asked to become chancellor of the Weimar Republic by President Paul von Hindenburg in 1932, Papen ruled by presidential decree. He negotiated the end of reparations at the Lausanne Conference of 1932. He also launched the Preußenschlag coup against the Social Democratic Party-led Government in the Free State of Prussia. His failure to secure a base of support in the Reichstag led to his removal by Hindenburg and replacement by General Kurt von Schleicher. Determined to return to power, Papen, believing that Adolf Hitler could be controlled once he was in the government, pressured Hindenburg to appoint Hitler as chancellor and Papen as vice-chancellor in 1933 in a cabinet ostensibly not under Nazi Party domination. Seeing military dictatorship as the only alternative to a Nazi Party chancellor, Hindenburg consented. Papen and his allies were quickly marginalized by Hitler and he left the government after the Night of the Long Knives in 1934, during which the Nazis killed some of his allies and confidants.