The title of Duke of Westminster was created by Queen Victoria in 1874 and bestowed upon Richard Grosvenor, the 3rd Marquess of Westminster.
The baronetcy of the Grosvenor family was created by James I in 1622. Sir Richard Grosvenor, the 6th Baronet, was created Baron Grosvenor in 1761 and in 1784 became both Viscount Belgrave and Earl Grosvenor under George III. The title Marquess of Westminster was bestowed upon Robert Grosvenor the 2nd Earl Grosvenor at the coronation of William IV in 1831.
The subsidiary titles are: Marquess of Westminster (created 1831), Earl Grosvenor (1784), Viscount Belgrave, of Belgrave in the County of Chester (1784), and Baron Grosvenor, of Eaton in the County of Chester (1761). The Marquessate is in the Peerage of the United Kingdom; the rest are in the Peerage of Great Britain. The courtesy title of the eldest son and heir to the Duke is Earl Grosvenor.
The Grosvenor family own a substantial amount of property, notably in Mayfair and Belgravia, and at least 500 roads, squares and buildings bear their name, including Grosvenor Place and Grosvenor Square.
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Heir Apparent: Hugh Richard Louis Grosvenor, Earl Grosvenor (b. January 29 1991)