The Grand Duchess of Luxembourg riding in an open carriage with Prince Philip, the Duke of Edinburgh, as they arrive at Buckingham Palace, London, June 13th 1972. (Photo by Ian Showell/Keystone/Getty Images)
The Grand Duchess of Luxembourg riding in an open carriage with Prince Philip, the Duke of Edinburgh, as they arrive at Buckingham Palace, London, June 13th 1972. (Photo by Ian Showell/Keystone/Getty Images)