LONDON, UNITED KINGDOM - MARCH 1: Queen Elizabeth II greets His Excellency Mr Christian Muzie Nkambule the High Commissioner of Swaziland, as he presents his Letters of Credence and was accompanied by Mrs Nkambule during a private audience at Buckingham Palace on March 1, 2017 in London, England.  (Photo by John Stillwell-WPA Pool/Getty Images)