olivia fitzroy, born olivia gwyneth zoe fitzroy, (may 27, 1921–december 24, 1969) was a british author of children's books. she was the granddaughter of muriel fitzroy, 1st viscountess daventry, raised to the peerage as widow of edward fitzroy, the speaker of the house of commons from 1928 until his death in 1943; her mother was a member of the famous guinness family. olivia fitzroy was one of five sisters.