John George Lambton (born 1792) was the son of William Henry Lambton and Lady Anne Barbara Frances Villiers. He attended Eton College, then joined the 10th Royal Hussars in 1809. Lambton became Member of Parliament for County Durham in 1813; politically, he had a reputation for radicalism and proposing electoral reform, earning him the nickname "Radical Jack". In 1828 he was raised to the peerage, becoming Baron Durham. In 1830 Durham was made Lord Privy Seal in Earl Grey's cabinet and was charged with producing a draft of the bill that became the Reform Act 1832. He resigned his position in 1833, and was created Earl of Durham shortly afterwards. He was a Freemason and became Deputy Grand Master of the United Grand Lodge of England in 1834.