Her parents were Brigadier-General Edward Sullivan and his wife Winifred, née Burns. She spent her early life in Glanmire, County Cork, Ireland growing up with two brothers, Adam and George, and practising her riding skills. When the Second World War broke out, Anne Sullivan volunteered for the First Aid Nursing Yeomanry and served six years as personnel driver, while her brother Adam was killed during the Norway campaign. After the war, she returned home to Ireland to stay with her father, and met Hugh Grosvenor, 2nd Duke of Westminster, in 1946. The enormously rich Duke, then married to his third wife Loelia but long separated, immediately bought property next to her family's home and asked his agent to ask Miss Sullivan to help with the flowers.
Duchess of Westminster
The 68-year-old Duke soon obtained divorce and Sullivan became his fourth wife on 7 February 1947. The new Duchess of Westminster was far wealthier than her three predecessors. The first of them, Constance Cornwallis-West, was the mother of the Duke's children, all of whom were older than the Duchess herself. The couple spent most of their time at Eaton Hall in Cheshire and Lochmore. They went to Norway every year, as the Duchess enjoyed fishing, farming, stalking, hunting and racing. In June 1953, the Duke and Duchess attended the coronation of Queen Elizabeth II. She was widowed the next month and retired to Eaton Lodge, where she spent the next 50 years of her life. Having inherited 120,000 acres from the 2nd Duke, the Duchess and her stepdaughter, Lady Mary, five years her senior, ranked eighth among the wealthiest landowners in Scotland. Anne, Duchess of Westminster, was a great fan of horse racing, and is notable as the owner of Last Suspect and Arkle. Through racing, she became a friend of Queen Elizabeth The Queen Mother. The Duchess was elected president of the Chester and West Cheshire branch of the Royal Society for the Prevention of Cruelty to Animals and actively took part in its work, while also supporting the establishment of the Clwyd Riding School for the Disabled. She died at Lochmore and was buried in the churchyard of Eccleston Church near Eaton Hall, Cheshire.