She was a daughter of Princess Alice and ancestress of modern Greek and British royals, including all genetically continuous monarchs from today's Prince Charles on through her daughter, also Princess Alice. Princess Alice's daughter's son Philip was raised by her son Louis Mountbatten. Philip married Elizabeth Windsor, Queen Elizabeth II. Louis Mountbatten looms large in modern history. He oversaw the defeat of imperial Japan in Burma and the independence of India. He was killed by a Provisional Irish Republican Army bomb in 1979. Her Wikipedia article is here.