The collection of maps, grants, seals and royal letters of patent and containing the will of William “Speaker” Conolly is to be donated to the State on Thursday.
It was discovered in a skip on Fitzwilliam Square, almost 40 years ago, by three friends out walking.
Robert Maharry, Richard Gorman and Ruary O Síocháin investigated the skip after Mr Maharry noticed a “pristine copy of The Irish Times” which had blown on to the ground; on inspection they discovered it dated November 12th, 1921.
Among the boxes of documents they came across a metal chest bearing the name of Capt Edward Michael Conolly of the Royal Artillery, and the address “Castletown”.
Papers in the box appeared to relate to land deals associated with Castletown, in Celbridge, and Leixlip Castle, also in Co Kildare, and other estates, but the men did not immediately investigate the contents fully.