DUBLIN, IRELAND - MAY 17: Queen Elizabeth II (R) poses with Irish President Mary McAleese as she arrives at the Aras an Uachtarain, the official residence of the President of Ireland, on May 17, 2011 in Dublin, Ireland. The Duke and Queen's visit is the first by a monarch since 1911. An unprecedented security operation is taking place with much of the centre of Dublin turning into a car free zone. Republican dissident groups have made it clear they are intent on disrupting proceedings. Getty Images