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WINDSOR, UNITED KINGDOM - JUNE 08: During His State Visit, Queen Elizabeth Ll Riding Her Horse 'burmese' In Windsor Great Park With President Reagan Who Is Riding 'centennial'. Wearing A Hacking Jacket, Jodhpurs And Riding Boots, She Wears A Headscarf In Place Of The More Traditional, And Safe, Protective Riding Hat. The Horses 'burmese' And 'centennial' Had Both Been Given To Her As A Gift. (Photo by Tim Graham/Getty Images)

WINDSOR, UNITED KINGDOM - JUNE 08:  During His State Visit, Queen Elizabeth Ll Riding Her Horse  'burmese'  In Windsor Great Park With President Reagan Who Is Riding 'centennial'.   Wearing A Hacking Jacket, Jodhpurs And Riding Boots, She Wears A Headscarf In Place Of The More Traditional, And Safe, Protective Riding Hat. The Horses 'burmese' And 'centennial' Had Both Been Given To Her As A Gift.  (Photo by Tim Graham/Getty Images)