The Dufferin Papers at the Public Record Office Northern Ireland (PRONI)

The Dufferin papers include around 96,000 documents and around 850 volumes, 1605, 1630 and 1651 to 1940, on the estates and political achievements of the Blackwood family of Clandeboye, near Bangor, Co. Down, Lords Dufferin and Marquesses of Dufferin and Ava.