Charlestown, Clogher, Co Roscommon
Mark Bence-Jones. A Guide to Irish Country Houses (originally published as Burke’s Guide to Country Houses volume 1 Ireland by Burke’s Peerage Ltd. 1978); Revised edition 1988 Constable and Company Ltd, London.
p. 81. “(King, Bt, of Charlestown/PB) A two storey late-Georgian house. Entrance front of three bays…”

http://landedestates.nuigalway.ie/LandedEstates/jsp/property-list.jsp?letter=C
In 1786 Wilson refers to Charlestown as the “the fine seat of Mr. King, most delightfully situated on the Shannon”. The first Ordnance Survey map marks both Charlestown House and Charlestown Old House closeby at M984 976. Valued at £46 at the time of Griffith’s Valuation. In 1894 Charlestown was the residence of Sir Gilbert King. The house is no longer extant but extensive estate architecture survives.
Not in National Inventory