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.