Mahon (Castlegar)
The Mahons were settled at Castlegar from the early 18th century. In 1711 the Earl of Clanricarde leased Castlegar to Bryan Mahon for lives renewable for ever. They intermarried on a number of occasions with members of the Browne family of Westport. In 1819 the head of the family became a baronet. In the 1830s, at the time of the first Ordnance Survey, Ross Mahon was the proprietor of several townlands in the parish of Ahascragh. The Mahon estate was one of the principal lessors in the parish of Grange, barony of Loughrea at the time of Griffith's Valuation. Mr. Charles Filgate acted as agent for this property. The Mahons also held extensive lands in the baronies of Clonmacnowen and Killian. In the 1870s the Castlegar estate amounted to over 8000 acres in county Galway as well as over 800 acres in the parish of Termonbarry, barony of Ballintober North, county Roscommon dated 1708. The county Roscommon estate was held on a lease for lives renewable for ever from Sir Arthur Shaen of Kilmore, county Roscommon. In 1906 Sir William Mahon held over 1200 acres of untenanted land in the Ahascragh area. MacLochlainn writes that most of the estate was sold to the Land Commission in 1977. The Mahon Papers, which document their estates in counties Galway and Roscommon, are available for consultation in the National Library of Ireland, Kildare Street, Dublin.
Associated Families
Houses
| Name | Townland | Civil Parish | PLU | DED | Barony | County | Map Ref | |
|---|---|---|---|---|---|---|---|---|
| Ahascragh Glebe/Rectory | Ahascragh West | Ahascragh | Ballinasloe | Ahascragh 1 | Kilconnell | Galway |
OSI Ref: M780386
OS Sheet: 61 Discovery map: 47 |
|
| Weston | Weston | Ahascragh | Ballinasloe | Ahascragh 1 | Clonmacnowen | Galway |
OSI Ref: M786396
OS Sheet: 61 Discovery map: 47 |
|
| Ballyglass House | Ballyglass (Mahon) | Ahascragh | Ballinasloe | Killure 2 | Clonmacnowen | Galway |
OSI Ref: M811358
OS Sheet: 74 Discovery map: 47 |
|
| Castlegar | Castlegar East | Ahascragh | Ballinasloe | Ahascragh 1 | Killian | Galway |
OSI Ref: M797 393
OS Sheet: 61 Discovery map: 47 |
|
| Killareeny | Killareeny | Aughrim | Ballinasloe | Aughrim | Kilconnell | Galway |
OSI Ref: M748302
OS Sheet: 86 Discovery map: 47 |
|
| Milverton | Ahascragh West | Ahascragh | Ballinasloe | Kilconnel | Galway |
OSI Ref: M776386
OS Sheet: 61 Discovery map: 47 |
|
Archival sources
- George C. Mahon Papers, mainly genealogical. MSS 22,190-22,245; National Library of Ireland
- Pedigree of Mahon of Loughrea, Oughterclooney, Beech Hill and Castlegar, Co Galway and of Co Tipperary. GO MS 177: 438-451; National Library of Ireland
- Pedigree of Mahon of Castlegar, c 1600-1818. GO MS 169: 250-251; National Library of Ireland
- Draft trees and abstracts from parish and newspaper records of family of Mahon of Castlegar, 1656-1935. GO MS 813: 9; National Library of Ireland
- Account of money expended on Eliza Robinson by Ross Mahon, Castlegar, her guardian, 1777-1785. MS 5004; National Library of Ireland
- Copy of grant of arms to descendants of Ross Mahon, 9 Sept 1819. GO MS 106: 116; National Library of Ireland
- Rentals of estates of the Mahon family at Castlegar, Co Galway & Termonbarry, Co Roscommon, 1841-1859, with some 20th century documents. MS 8553; National Library of Ireland
- Mahon Papers, collection of estate and family records 1690-1957. Collection List 149, MSS 47,791-47,969 & MSS L 199-262; National Library of Ireland
- Weston. Photographs. 022/096.; Irish Architectural Archive
- Castlegar photos & press cuttings & a Christies sale catalogue. 0088/049 & D.CAS 4.0; Irish Architectural Archive
- Mahon of Castlegar Papers, sketch plans of Castlegar House and plan of farmyard at Westport House, c 1800. MS 24,593; National Library of Ireland
- Mahon Papers, mainly rentals, account books & diaries, 18th-19th centuries. MSS 9168-9172, MSS 19,963-19,999, MSS 23,001-23,047, MSS 23,344-23,474, MS 25,061.; National Library of Ireland
- Guinness Mahon & Co Collection, includes conveyances of lands in Co Mayo in a chancery case Mahon v Mahon, 1862. Small Accs. Index 59, D.5884-5885; National Archives of Ireland
- Catalogue for sale of contents of Castlegar House by Hamilton, Osborne & King & Christies, property of John Horan, 24 & 25 May 1988. SCRR; James Hardiman Library, University of Galway
Contemporary printed sources
- ''GRIFFITH'S VALUATION OF IRELAND'[Primary Valuation of Tenements]', 1850-1858. : Ballinasloe Union, 6 (Weston & Ballyglass), 53, (Ahascragh Glebe), 54 (Ahascragh West), 90 (Castlegar).
- HUSSEY DE BURGH, U. H. ''The Landowners of Ireland. An alphabetical list of the owners of estates of 500 acres or £500 valuation and upwards in Ireland''. Dublin: Hodges, Foster and Figgis, 1878. [available online at www.askaboutireland.ie] : 303
- PARLIAMENTARY PAPERS. ''Return of owners of land of one acre and upwards, in the several counties .... in Ireland''. HC 1876, LXXX: 298 & 317
- PARLIAMENTARY PAPERS. ''Return of names of proprietors and area and valuation of properties in counties in Ireland, held in fee or perpetuity or long leases at chief rents,'' 1876. (412) LXXX. 395: 148.
- LEWIS, Samuel. ''A Topographical Dictionary of Ireland''. London: S. Lewis & Co., 1837: Vol I, 23 (Castlegar, Creggaun & Weston)
- LEET, Ambrose. ''A directory to the market towns, villages, gentlemen's seats, and other noted places in Ireland''. Dublin: Printed by B. Smith, 1814 : 99 (Castlegar)
- DUTTON, Hely. ''Statistical and agricultural survey of the county of Galway''. Dublin: Royal Dublin Society, 1824. : 414
- PARLIAMENTARY PAPERS. ''Return of Untenanted Lands in Rural Districts, Distinguishing Demesnes on Which There is a Mansion...'', HC 1906, c, 177: 306.
- TAYLOR, George & SKINNER, Andrew. ''Maps of the Roads of Ireland, surveyed in 1777 and corrected down to 1783''. Facsimile of 2nd edition. Shannon: Irish University Press, 1969: 236 (Castlegar)
- LEGG, Marie Louise (ed). ''Census of Elphin 1749''. Dublin: Irish Manuscripts Commission, 2004: 254 (Castlegar) & 256 (Balliglass)
- ORDNANCE SURVEY NAME BOOKS, County Galway, http://places.galwaylibrary.ie/default.html: Ahascragh Parish
- WILSON, William. ''The Post-Chaise Companion or Travellers Directory Through Ireland''. The author: Dublin, 1786 : 419 (Castlegar)
- BATEMAN, John. ''The great landowners of Great Britain and Ireland''. London: Harrison, 1883. : p.295
- ''GRIFFITH'S VALUATION OF IRELAND'[Primary Valuation of Tenements]', 1850-1858. : Athlone Union, 9 (Ladywell)
Modern printed sources
- BENCE-JONES, Mark. ''A Guide to Irish Country Houses''. Revised ed. London: Constable, 1988. : 68
- NATIONAL LIBRARY OF IRELAND. Reports on Private Collections: Mahon Papers, No. 47
- NATIONAL LIBRARY OF IRELAND. Special Lists.: Mahon Papers, now in NLI. No. 207
- ''Analecta Hibernica'': AINSWORTH, J.F. Report on the Mahon Papers. XXV (1967),79-93
- MACLOCHLAINN, Tadgh. ''A historical summary on the parish of Ahascragh, Caltra and Castleblakeney''. The author, 1979: 28-30
- MOSLEY, Charles (ed). ''Burke's Peerage and Baronetage''. Crans, Switzerland: Burke's Peerage (Genealogical Books) Ltd, 1999: II, 1825-1826
- GLIN, Knight of, GRIFFIN, D. J. & ROBINSON, N.K (eds).'' Vanishing Country Houses of Ireland''. Dublin: Irish Architectural Archive/Irish Georgian Society, 1989. : 78 (Weston)
- FRANZ, Peter B. ''Jane's letters from Ireland, 1884-1886.'' Durham: Pentland Press, 1999. : All.
- JONES, Ivy Frances. ''The rise of a merchant bank: Guinness Mahon''. Dublin: Guinness Mahon, 1974. : All.
- ''The Irish Genealogist'': MELVIN, Patrick. The composition of the Galway gentry. VII No. 1(1986), 86-87
- MELVIN, Patrick. ''Estates and landed society in Galway''. (Dublin: Éamonn de Búrca, 2012). : 58-60
- O'Brien, Donal. ''The Houses and Landed Families of Westmeath''. The author, Athlone (2nd edition 2015): 136