The Lambert family came originally from Yorkshire but were settled in county Galway since the reign of Elizabeth I. The Castle Ellen family are descended from the Cregaclare Lamberts, one of whom, Charles, was killed at the siege of Derry. Charles' great-grandson, Walter Peter, is described as "of Castle Ellen" in the later 18th century. Walter Lambert of Castle Ellen owned over 3000 acres in county Galway in the 1870s. In 1906 the representatives of Peter F. Lambert held over 370 acres of untenanted demesne lands as well as the house at Castle Ellen.
- Castle Ellen. Photographs. 024/070.; Irish Architectural Archive
Contemporary printed sources
- ''GRIFFITH'S VALUATION OF IRELAND'[Primary Valuation of Tenements]', 1850-1858. : Galway Union, 149.
- PARLIAMENTARY PAPERS. ''Return of owners of land of one acre and upwards, in the several counties .... in Ireland''. HC 1876, LXXX: 297.
- 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] : 257
- LEET, Ambrose. ''A directory to the market towns, villages, gentlemen's seats, and other noted places in Ireland''. Dublin: Printed by B. Smith, 1814 : 98.
- PARLIAMENTARY PAPERS. ''Return of Untenanted Lands in Rural Districts, Distinguishing Demesnes on Which There is a Mansion...'', HC 1906, c, 177: 313.
- 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: 149.
- ORDNANCE SURVEY NAME BOOKS, County Galway, http://places.galwaylibrary.ie/default.html: Athenry Parish
- SLATER, Isaac. ''Royal National Directory of Ireland: List of the principal seats''. (Manchester: 1894) : xxiv, 15