Which important female figure of the 20th century was nicknamed "Shy Di"?

Diana, Princess of Wales (born July 1, 1961, Sandringham, Norfolk, England—died August 31, 1997, Paris, France) was the Princess of Wales, former consort (1981–96) of Charles, Prince of Wales (later Charles III); mother of the heir apparent to the British throne, Prince William; and one of the foremost celebrities of her day. On February 24, 1981, Princess Diana's engagement with Charles was announced, and her beauty and shy demeanor—which earned her the nickname "Shy Di"—made her an instant sensation with the media and the public. The couple married in St. Paul's Cathedral on July 29, 1981, in a globally televised ceremony watched by hundreds of millions.

Source: Britannica