Ceremonies to mark the 400th anniversary of the Flight of the Earls will be announced tomorrow, it emerged tonight.
Last year the Government set up a cross-departmental committee to decide how to mark the watershed event in Ireland's history.
In September 1607, Hugh O'Neill, 2nd Earl of Tyrone and Rory O'Donnell, 1st Earl of Tyrconnell and 90 of their followers fled to Europe.
Their armies had been defeated by the English and they feared arrest and execution.
The exodus led to the demise of the ancient Gaelic aristocracy in Ireland and paved the way for the Plantation of Ulster.
A Government spokeswoman confirmed tonight that a comprehensive programme of quadcentenary events will be announced tomorrow by the Taoiseach in Government Buildings.
There are currently exhibitions dedicated to the Flight of the Earls in Cos Donegal and Derry.