The house has already been sold and the rare treasures within have been accumulated by the diocese over many years.
The magnificent contents include real rarities like a William IV console table with an Italian marble top, a 12-foot-long dining table, and a second console with provenance from Tandragee Castle.
In the 1950s, the Duke of Manchester sold Tandragee to local businessman Thomas Hutchinson, who funded Tayto. The castle houses the offices for Tayto Crisps.
A decanter, presented to Pope Pius IX, who reigned for nearly 32 years from 1846, on his sacerdotal jubilee by the town of Velletri, Italy is among an exceptional collection of ecclesiastical items. The provenance for the decanter is impeccable.
An assortment of brass liturgical pieces includes altar candle holders, crucifixes, and an elegant lectern. An early 20th-century set of the Stations of the Cross is mounted in its original frames.
Interior highlights include a gilt Regency mirror by Richard Jackson of Essex Bridge, Dublin. This is similar to the one on display at the Waterford Treasures Museum.
A pair of scagliola marble columns, each over a metre tall, lent an air of opulence to the Bishop's House.
A selection of art with religious themes includes a depiction of the martyrdom of St Andrew. Many of the artworks are contained within spectacular gilt frames.
Garden pieces include a 19th-century limestone sundial and a collection of 19th-century stone troughs.
Viewing for this singular sale gets underway in Newry on Saturday, February 8, and will continue on February 9 and 10.
The auction will be held at The Mourne Country Hotel from 6pm on February 12 and 13. It will also be online.