Otto I of Bavaria, (Otto Wilhelm Luitpold Adalbert Waldemar Wittelsbach) (27 April 1848 – 11 October 1916) was King of Bavaria from 1886 to 1913. He was the son of Maximilian II and his wife, Marie of Prussia, and younger brother of Ludwig II. Otto of Bavaria is not to be confused with Otto of Greece, who was his uncle.
When the Prussian king Wilhelm was proclaimed German Emperor on January 18, 1871 in Versailles Palace Prince Otto represented his brother who refused to participate. Otto then criticized the celebration as blustering and crushing in a letter to Ludwig.
Otto became King of Bavaria upon his older brother's death in 1886. However, Otto never truly ruled as King and was by some accounts not even aware that he had become King. Otto suffered from severe mental illness and had been declared insane in 1875. He was kept confined in Fürstenried Palace under medical supervision until his death. Otto's uncle, Prince Luitpold of Bavaria, served as Prince Regent for Otto until Luitpold's death. Luitpold's son Ludwig then became the next Prince Regent.
The constitution of Bavaria was amended on 4 November 1913, to include a clause specifying that if a regency for reasons of incapacity lasted for ten years with no expectation that the King would ever be able to reign, the Regent could proclaim the end of the regency and assume the crown himself.
The following day, Otto was deposed by his cousin, Prince Regent Ludwig, who then assumed the title Ludwig III. The parliament assented on 6 November, and Ludwig III took the constitutional oath on 8 November. Otto was permitted to retain his title and honours, which he did until his death in 1916.
Otto's body was interred in the crypt of the Michaelskirche in Munich.
This information is from the site at
http://en.wikipedia.org/wiki/Otto_of_BavariaByron.