Britain's Queen Elizabeth arrives in Ireland on historic visit - PHOTOS & VIDEO

PHOTOS - The Queen's historic visit to Ireland photo gallery

The Regal has landed – Queen Elizabeth is on Irish soil and on her way to lunch with President Mary McAleese amid massive security.

The Royal Jet landed at Casement Aerodrome, home to the Irish Aer Corps, at noon at the start of a four day State visit

Clad in emerald green, Queen Elizabeth and her husband Prince Phillip were greeted by Minister for Foreign Affairs Eamonn Gilmore, leader of the Labor Party.

After a brief walk down the red carpet, she was presented with a bouquet of flowers by a young girl before making her way to the President’s residence in the Phoenix Park. The girl who presented the flowers was eight year old Rachel Fox from Shankill in Dublin

The most expensive security arrangements in the history of the State marked the arrival of the first British monarch to visit the Republic since the establishment of the state.

A hundred years after her grandfather King George visited Ireland, the Queen was greeted at Aras an Uachtarain by President McAleese and her husband Martin.

On arrival, she is to plant a tree in the gardens of the Presidential residence in honor of the peace process.

After a bacon and cabbage lunch, the Queen will visit the Garden of Remembrance in Parnell Square where she will lay a wreath in honor of the leaders of the 1916 Rising.

PHOTOS - The Queen's historic visit to Ireland photo gallery

Protestors from the Eirigi Republican group have already gathered near the Garden, opened in 1966 to celebrate the 50th anniversary of the Rising.

The Royal party will be shielded from the protestors by a massive police presence and they are not expected to disrupt the ceremony.

The small protest follows the discovery of a viable device on a bus in Maynooth on Monday night and bomb threats in Belfast and London.

The British Foreign Office said they had full faith in the Irish security forces and were adamant the trip would go ahead and adhere to its full itinerary.

After lunch, the Queen will travel up O’Connell Street to Trinity College for a private viewing of the Book of Kells.

Later this week, she will be guest of honor at a state dinner in Dublin Castle before travelling to Kildare, Tipperary and Cork before departing for London on Friday.

PHOTOS - The Queen's historic visit to Ireland photo gallery