John Tew Armstrong, a solicitor of Dominick Street, Dublin, was a younger brother of William Jones Armstrong of Armagh. John T. Armstrong appears to have purchased some of the Mountcashell estate in the barony of Condons and Clangibbon, county Cork. In November 1865 his estate at Boolabwee and Coolaneague amounting to over 400 acres in the barony of Condons and Clangibbon, was advertised for sale. In the 1870s he owned 527 acres in county Meath and his nephew Henry B. W. Armstrong owned over 4,000 acres in counties Armagh and Longford.
No houses were found for this estate
- Armstrong (of Dean's Hill, Armagh) Papers, 19th & 20th centuries. D3727; Public Record Office, Northern Ireland
- Landed Estates’ Court Rentals (O’Brien), Armstrong, 24 Nov 1865, Vol 79 (26), MRGS 39/038, (microfilm copy in NUIG); National Archives of Ireland
- Pedigree of Armstrong family of Cork (Leader Collection); Irish Genealogical Research Society Library