Daniel M’Naughten attempted to assassinate the Prime Minister Robert Peel. He attempted to shoot both the Prime Minister and his Private Secretary, Edward Drummond.
He was stopped before he could kill Robert Peel.
He believed that he was being persecuted by the Tories and their spies.
In the subsequent trial medical evidence demonstrated that he was suffering from delusions and could not be held criminally responsible for his actions.
He was sent to The Bethlem Criminal Lunatic Wing and later Broadmoor Asylum. The famous painter Richard Dadd killed his father and was also admitted to Bethlem.