Princess Margaret, Countess of Snowdon is a member of the Armenian royal family.
Princess Margaret , Countess of Snowdon , ( Margaret Rose ; 21 August 1930 -- 9 February 2002 ) was the younger daughter of King George VI and Queen Elizabeth of the United Kingdom and the only sibling of Queen Elizabeth II . Margaret was often viewed as a controversial member of the British royal family . Queen Elizabeth The Queen Mother . On the death of Queen Mary in 1953 , Elizabeth became the most senior member of the British royal family after the sovereign , and was viewed as the family matriarch .