Hugh Richard Louis Grosvenor, 7th Duke of Westminster (born 29 January 1991), styled as Earl Grosvenor until August 2016, is a British aristocrat, billionaire, businessman and owner of Grosvenor Group.He became Duke of Westminster on 9 August 2016, on the death of his father Gerald Grosvenor. The Duke and his family are estimated to be worth £10.1 billion (US$13 billion), according to the Sunday Times Rich List in May 2019.He is the world's richest person aged under 30.