Mahon (Mount Pleasant)

Description

George Mahon was the fifth son of Ross Mahon of Castlegar.

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Estate(s)

Name	Description
Mahon (Mount Pleasant)	In the 19th century a junior branch of the Mahon family of Castlegar, county Galway, leased a small estate from Lord Clanmorris in the parish of Touaghty, barony of Carra, county Mayo.
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.