While Lady Louise is not a working royal, Queen Mary is a central figure in the history of the British Royal Family.
She was born in Kensington Palace in 1867 and was the daughter of Francis, Prince and Duke of Teck, and Princess Mary Adelaide of Cambridge, granddaughter of George III.
She married King George V in 1893 and they had six children together, including Prince Edward of York, later King Edward VIII, and Prince Albert of York, later King George VI, the father of the late Queen Elizabeth II.
Queen Mary Consort acted as a mentor to her granddaughter the late Queen as she was growing up and encouraged her to have access to more education.
Royal historian professor Kate Williams told Sky News: “She felt she should take Elizabeth under her wing because her parents were busy being monarchs.
“Elizabeth was already well behaved, very conscientious, very dutiful and not very externally emotional, but Queen Mary enhanced this with her advice and the Queen did listen very carefully.
“She died before Elizabeth’s coronation and I think that was sad for her because her grandma couldn’t go to her coronation as she expected her to.”
Queen Elizabeth was close with both her grandmother Queen Mary Consort and her granddaughter Lady Louise Windsor, suggesting that the two women may also have got along well if they had ever met.
Lady Louise Windsor is currently living in Scotland for university, with photos showing her enjoying the university life with her new boyfriend.