Michael Robert Hamilton Holmes à Court (27 July 1937 – 2 September 1990) was a South African-born Australian businessman who became Australia's first billionaire, before dying suddenly of a heart attack in 1990 at the age of 53. Holmes à Court died intestate and his estate was to be divided one-third for his widow Janet (née Ranford), and the remainder equally among their four children, who include Peter and Simon.