Their untimely deaths—Diana in a 1997 Paris car crash while pursued by paparazzi, and Carolyn and John F. Kennedy Jr. in a 1999 plane crash—prompted vast public mourning and showed how the Kennedys and Windsors grieve on a global stage. From Jackie Kennedy’s rapport with Queen Elizabeth to modern tributes and screen retellings, the two dynasties remain intertwined in the public imagination.