William Douglas, 4th Duke of Queensberry

His Grace The Duke of Queensberry
The Duke of Queensberry by John Opie
Born	16 December 1724 (1724-12-16) Peebles
Died	23 December 1810 (1810-12-24) (aged 86) London
Occupation(s)	Scottish noble (substantial landowner), racehorse owner, 1760s representative (House of Lords seated) peer
Children	Maria Seymour-Conway, Marchioness of Hertford
Parent(s)	William Douglas, 2nd Earl of March Lady Anne Hamilton

William Douglas, 4th Duke of Queensberry, KT (16 December 1724 – 23 December 1810) was a Scottish noble landowner. He was popularly known as Old Q and was reputed as a high-stakes gambler.^[1] In 1799 he was estimated the eighth-wealthiest man (or small family unit) in Britain, owning £1M (equivalent to £124,100,000 in 2023). He is one of ten known British millionaires that year, the royal family excluded.