Dukes in the United Kingdom
Duke, in the United Kingdom, is the highest-ranking hereditary title in all four peerages of the British Isles. A duke thus outranks all other holders of titles of nobility (marquess, earl, viscount and baron).
Hereditary peer
The peerage has traditionally been associated with high gentry, the British nobility, and in recent times, the Conservative Party. Only a tiny proportion of wealthy people are peers, but the peerage includes a few of the very wealthiest, such as Hugh Grosvenor (the Duke of Westminster) and Lord Salisbury of Hatfield House. Most of the largest stately homes belong to the National Trust due to forms of estate tax. A few peers own one or more of England's largest estates passed down through inheritance, particularly those with medieval roots: until the late 19th century the dominant English and Scottish land division on death was primogeniture.