Sales of Irish country house contents
The dispersion of artefacts, through the Sale of Irish country house contents, occurred over a period of hundreds of years starting with major sales after the Irish Rebellion of 1798 and later with the financial after effects of the Irish famine leading to the creation of the Encumbered Estates' Court in 1849. Later surges in sales and destruction of items occurred during the Easter Rising in 1916 and later again with the destruction of Irish country houses during the Irish War of Independence.
Source: Wikipedia — Sales of Irish country house contents (CC BY-SA 4.0)