Londonderry Estate Office Archive

Papers of the Londonderry Estate Office, Newtownards, Co. Down, 1629-1940. Relating to lands held by the Marquesses of Londonderry in Counties Donegal, Down and Londonderry, this collection comprises a comprehensive range of extant estate papers, correspondence and other papers pertaining to the administration and management of the estate and related concerns. The collection includes: title deeds, testamentary papers, 1670-1850; leases, late 17th Century-c. 1870; maps, plans and surveys, 1721-c.1850, including the manors of Newtown and Comber made in the 1720s by John Sloane and those of individual townlands on the Newtown, Comber and Florida estates made in the late 18th century by David Geddes; account books, rentals, and related correspondence, 1720-c.1850 including a journal of the Bangor and Newtown lead mine, 1780-82 and account book of the Craiganu slate quarry, 1807-1818; returns of live and dead stock in Co Down maritime parishes at the time of the threatened French invasion (1803); inventories of furniture and books at Mount Stewart; late 18th century plans and elevations for buildings in the Square and elsewhere in Newtownards; late 18th century plans of the Mount Stewart demesne; maps of road systems in Ards Lower generally and the Comber-Newtownards area in particular from the mid 18th century; and a group of early 19th century plans showing reclamation schemes in Strangford Lough. Although not entirely relevant to the business of the estate office, the collection also features: local government, election and electoral registry material, c. 1791-1871; business records and accounts of Alexander Stewart (1699-1781) and his Belfast partners relating to trade with Russia in the Baltic, 1725-35; and business records, 1722-34, of Sir Robert Cowan (d. 1738) of the East India Company, Governor of Bombay, and father-in-law of Alexander Stewart, relating to a protracted lawsuit over his will, and also concerning trade with India relating to prices, markets, the factory at Surat, the poor standard of living of the Surat community, piracy etc.


Of great interest to those researching estate management over a long period; early trade records; the history of the Londonderry family and properties; the history and development of Newtownards and Comber;

Physical characteristics

Approx. 12,000 documents and volumes occupying c.60 PRONI boxes

Description or Catalogue

See PRONI reference D/654 for catalogue of the papers. The catalogue is available for consultation in PRONI's Public Search Room. See also for a more detailed introduction to the collection.


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Added by PRONI | Last updated on: 25 August 2018