The M'Naghten rule is/are a legal test defining the defence of insanity that was formulated by the House of Lords in 1843. It is the established standard in UK criminal law. Versions have been adopted
Daniel M'Naghten, c. 1856
A portrait of Daniel M'Naughten. Illustration for The Illustrated London News, 4 February 1843
Sir Robert Peel, 2nd Baronet, was a British Conservative statesman who served as Prime Minister of the United Kingdom, Chancellor of the Exchequer, and Home Secretary. He is regarded as the father of
M'Naghten rules
…Daniel M'Naghten on the charge of murdering Edward Drummond. M'Naghten had shot Drummond after mistakenly identifying him as the British Prime Minister Robert Peel, who was the intended target. The acquittal of M'Naghten on the basis of insanity, a hitherto unheard-of defence per se in modern form, caused a public…
Portrait by Henry William Pickersgill
Christ Church, Oxford, which Peel attended 1805–1808, graduating with a double first. He was later MP for the university, 1817–1829.
The Duke of Wellington and Sir Robert Peel, 1844, by Franz Xaver Winterhalter
Burking Poor Old Mrs Constitution. This satirical 1829 cartoon by William Heath depicted the Duke of Wellington and Peel in the roles of the body-snatchers Burke and Hare suffocating Mrs Docherty for sale to Dr. Robert Knox; representing the extinguishing by Wellington and Peel of the 141-year-old Constitution of 1688 by Catholic emancipation.