Original copy of 1921 Anglo-Irish Treaty to be displayed for the first time

Members of the Irish delegation at the signing of the Irish Free State Treaty between Great Britain and Ireland, London, England, December 6, 1921. The delegation includes, seated from left: Sinn Fein founder Arthur Griffith (1871-1922); EJ Duggan, minister for finance; Michael Collins (1890- 922) and politician Robert Barton (1881-1975). Standing from left are author Robert Erskine Childers (1870-1922); lawyer George Gavan Duffy (1882-1951); and John Chartres. Picture: Mansell/Time & Life Pictures/Getty Images

An original copy of the 1921 Anglo-Irish Treaty is set to go on public display for the very first time next month, to mark the first centenary of the agreement.

Described as the “most famous” document in Irish history, the National Archives is launching an exhibition in Dublin Castle relating to the Treaty which formalised the separation of Ireland, but saw the departure of British forces from 26 counties, on the creation of the Irish Free State.