Paul von Hindenburg was a German field marshal, politician, and president of the Weimar Republic. After a successful career in the military, Hindenburg was called back to service at the start of WWI, and he became the Chief of General Staff in 1916. His achievements brought him arguably higher esteem than the Kaiser himself. After the war, he was elected the second president of Germany in 1925.
He defeated Hitler in 1932 to win a second term at the age of 84. However, his failing health and the instability of the Weimar Republic led him to appoint Hitler Chancellor in 1933. When he died a year later, Hitler took over as head of state.