The contents of Luttrellstown Castle in Dublin including furniture, paintings and objets d'art will be auctioned by Christie's of London and Hamilton Estates.
Christie's representative in Ireland, the Knight of Glin says the auction will be "The Irish Sale of the Century".
Items up for auction include a suite of French furniture from the Château de Maintenon, an extendable dining room table and a carpet made for Czar Nicholas I in Russia.
The Knight of Glin is only a protectionist when it comes to things of Irish importance and would not consider it a major loss to Ireland if a lot of the items are sold to overseas buyers.
I'm afraid the fine art world is something that moves fairly freely. I'm personally not a protectionist. I am a protectionist when things of considerable Irish importance are involved.
The contents of the house have been collected over the years by Aileen Plunket, a member of the Guinness family, who is now moving to London.
An RTÉ News report broadcast on 25 September 1983.