S Queen Elizabeth II and Prince Philip, Duke of Edinburgh walk past the castle as they arrive at the ancient Rock of Cashel, reputed to be the site of the conversion of the King of Munster by St. Patrick in the 5th century, on the fourth and final day of the first-ever state visit to Ireland by helicopter on May 20, 2011. The Duke and Queen's visit to Ireland is the first by a monarch since 1911. IRELAND-20/05/2011.