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. Richard Grosvenor the 6th Baronet was created Baron Grosvenor of Eaton 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 (1784) and Baron Grosvenor (1761). The Marquessate is in the Peerage of the United Kingdom; the remaining are in the Peerage of Great Britain. The courtesy title of the eldest son and heir to the Duke is Earl Grosvenor.
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2 Earls Grosvenor (1784)
3 Marquesses of Westminster (1831)
4 Dukes of Westminster (1874)
Earls Grosvenor (1784)
Marquesses of Westminster (1831)
Dukes of Westminster (1874)