- In the mid 19th century Lieutenant Colonel Thomas M. Peers Williams held an estate in the parishes of Dysart and Taghmaconnell, barony of Athlone, county Roscommon. In the 1870s he owned 3,062 acres in county Roscommon. His address was Middlesex, England. Lieutenant Colonel Thomas Peers Williams was a grandson of Thomas Williams of Anglesey and Catherine Lloyd. His seat is recorded as Temple House, Great Marlow, Buckinghamshire. His son Owen Lewis Cope Williams married a daughter of St George Francis Caulfield of Donamon.
Molyneux (Co Roscommon)
- Samuel Molyneux of county Armagh bought lands in the parish of Taghmaconnell, barony of Athlone, county Roscommon, from the Earl of Clanricarde in the first decade of the 18th century. The Ordnance Survey Name Books show that S. J. Molyneux had an estate in the parish of Taghmaconnell in the 1830s. By the time of Griffith's Valuation most of this estate was in the possession of Lieutenant Colonel Thomas M. Williams.