I am learning about Dame Margaret Helen Greville. She and her husband Ronald Greville, who died in 1908, had no children. From what I glean from on-line references, she was an only child. Besides the jewels bequeathed to Queen Elizabeth, she left £20,000 to Princess Margaret and £25,000 to Queen Victoria Eugenia of Spain. She left her property Polesdon Lacey to the National Trust. She had been friends with both Queen Mary and Queen Elizabeth. [Wikipedia]