Duke of Westminster
Gerald Cavendish Grosvenor (1951–2016) Duke since 1979; married Natalia Phillips, a distant relative of the British and Russian royal families. He was, according to the Sunday Times Rich List 2016, worth £9.35 billion (c. US$13 billion). He was sixth in the list and the third-richest British citizen. He was the richest member of the peerage, with a wealth significantly greater than Queen Elizabeth.