President of Botswana Seretse Khama (1921-1980) and his wife Ruth Williams Khama (1923-2002) arrive at Heathrow Airport in London for a visit to the United Kingdom on 13th August 1973. (Photo by Daily Express/Hulton Archive/Getty Images)
President of Botswana Seretse Khama (1921-1980) and his wife Ruth Williams Khama (1923-2002) arrive at Heathrow Airport in London for a visit to the United Kingdom on 13th August 1973. (Photo by Daily Express/Hulton Archive/Getty Images)