The Molyneux family settled at Castle Dillon in county Armagh in the 17th century. Thomas Molyneux, physician general to the army was created a baronet in 1730. His father, Samuel Molyneux, was granted over a thousand acres in the barony of Clanwilliam, county Limerick in 1666. At the time of Griffith's Valuation Sir Capel Molyneux held an estate in county Limerick in the parishes of Killeenagarriff, Stradbally and Clonkeen, barony of Clanwilliam. In the 1870s his county Limerick estate amounted to 1,388 acres. He also owned 5,463 acres in Queen's county (Laois), 3,416 acres in county Armagh and 2,426 acres in county Kildare.
Limerick City Museum:
Conveyance of Ballinvrinny [Ballinvreena, barony of Coshlea], Sir Capel Molyneux to Godfrey Lill 13th Oct 1778. LM1999.0029
National Library of Ireland:
Domvile Papers: documents re the Molyneux estate in Cos Armagh, Kildare, Leix, Dublin & Limerick, 19th century. MS 11,786