Who was elected elected President of Germany in 1925 and whose death led to the referendum on merging the posts of Chancellor and President?
Paul von Hindenburg Paul Ludwig Hans Anton von Beneckendorff und von Hindenburg (   ), known generally as Paul von Hindenburg (] ; 2 October 1847 – 2 August 1934) was a German military officer, statesman, and politician who largely controlled German policy in the second half of World War I and served as the elected President of Germany from 1925 until his death in 1934. He played the key role in the Nazi "Seizure of Power" in January 1933 by appointing Adolf Hitler chancellor of a "Government of National Concentration", even though the Nazis were a plurality in cabinet.
Otto of Bavaria Otto (German: "Otto Wilhelm Luitpold Adalbert Waldemar" ; 27 April 1848 – 11 October 1916), was King of Bavaria from 1886 to 1913. However, he never actively reigned due to severe mental illness; his uncle, Luitpold, and cousin, Ludwig, served as regents. Ludwig deposed him in 1913 a day after the legislature passed a law allowing him to do so, becoming king in his own right.