It is the most important private collection of Irish history material in public hands, comprising over 100,000 items spanning 400 years. It includes artefacts associated with Theobald Wolfe Tone; letters from Michael Collins, Douglas Hyde, Michael Davitt and O’Donovan Rossa.

It also contains rare books, proclamations, posters, political cartoons, pamphlets, handbills, works by Sir John Lavery, maps, hunger strike material and personal items from Leaders of the 1916 Rising.

Thousands of items can be seen on display in the Jackie Clarke Collection.