WINDSOR, UNITED KINGDOM - APRIL 10: Queen Elizabeth ll with Ireland's President Michael D Higgins (R) greet Northern Ireland's Deputy First Minister Martin McGuinness (L), First Minister Peter Robinson (2nd L) and Britain's Secretary of State for Northern Ireland Theresa Villiers (3rd L) during a Northern Ireland-themed reception at Windsor Castle on April 10, 2014 in Windsor, United Kingdom. The event was organised as part of Irish President Michael D Higgins' (R) four-day state visit. The visit comes three years after Queen Elizabeth II made a groundbreaking trip to the republic, which helped to heal deep-rooted unease and put British-Irish relations on a new footing. (Photo by Luke MacGregor - WPA Pool/Getty Images)
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