Landed Estates
NUI Galway

O'Conor Don

The O'Conor Don ancestral lands were in County Roscommon centred on Clonalis House near Castlerea. Alexander O'Conor Don died in 1820 without male heirs and the title was inherited by the O'Conors of Bellanagare. Some members of the O'Conor family of Bellanagare were distinguished antiquarians, see the ''Oxford Dictionary of National Biography''. In 1828 O'Conor Don of Belanagar was a member of the Grand Panel of county Roscommon. At the time of Griffith's Valuation, Charles Owen O'Conor was one of the principal lessors in the parishes of Kilcorkey and Kilkeevin, barony of Castlereagh. In the 1870s the O'Conor of Clonalis estate amounted to over 12,000 acres in county Roscommon with another 1000+ acres in county Sligo. At the same time Dennis O'Connor of Kingstown, county Dublin, brother of the O'Conor Don held 751 acres in county Roscommon and 287 in county Meath. In 1879 Charles Owen O'Conor offered for sale lands at Drimina, barony of Lyney, county Sligo. By March 1916 a final offer from the Congested Districts' Board for 1,368 acres belonging to Charles W. O'Conor, nephew of Charles Owen O'Conor Don had been accepted. A similar acreage (1,382) the estate of his mother Ellen I. O'Conor was vested in the Congested Districts' Board on 10 Feb 1916. The estate and family records are still held at Clonalis House. See for more information.


Name Townland Civil Parish PLU DED Barony County Map Ref
Clonalis House Cloonalis Kilkeevin Castlerea Cloonfower 66 Castlereagh Roscommon OSI Ref: M660808
OS Sheet: 26
Discovery map: 32
Hermitage Ballaghcullia Kilcorkey Castlerea Bellenagare 70 Castlereagh Roscommon OSI Ref: M752892
OS Sheet: 15
Discovery map: 33
Mount Allen House/Lough Allen Cottage Mountallen Kilronan Boyle Lough Allen 44 Boyle Roscommon OSI Ref: G948134
OS Sheet: 2
Discovery map: 26
Bellanagare Castle Bellanagare Kilcorkey Castlereagh Bellanagare 70 Castlereagh Roscommon OSI Ref: M750 877
OS Sheet: 15
Discovery map: 33

Archival sources

  • Pedigree of O'Conor, kings of Connacht and O'Conor Don, 364-1824. GO Ms.169, 254-61. ; National Library of Ireland
  • Domestic & farm accounts & personal memoranda, kept largely in Irish, of Charles O'Conor, Belnagare, 1742-45. [Casey Manuscripts], Microfilm copies at NLI, p.2935. ; National Library of Ireland
  • Pedigree of O'Conor Don of Belnagare &Clonalis, Lucan House, county Dublin & Lake Park, Roundwood, county Wicklow. 1800-1946. GO Ms.182, 583-4. ; National Library of Ireland
  • O'Conor Papers, dating from 1580. Contact Pyers O'Conor-Nash, Clonalis House, Castlerea, Co Roscommon; Private Possession
  • Cuttings & notes compiled by R.D. Walshe re Co Roscommon, including the O'Conors of Bellangare and the O'Conor Don, c 1915. MS 14,033; National Library of Ireland
  • Local History Files - Clonalis & O'Connor; Roscommon County Library
  • Land Judges' Court Rentals (O'Brien), O’Conor Don, 14 February 1879, Vol 135, MRGS 39/060, (microfilm copy in NUIG); National Archives of Ireland
  • Commonplace Book of [Julia Molyneux who married William John Talbot of Mount Talbot in August 1897] containing photographs, sketches and autographs relating to some of the 'big houses' and their residents, 1897-1901.; Representative Church Body Library

Contemporary printed sources

Modern printed sources