John Curtin/Curtain held at least two townlands in the parish of Doneraile, barony of Fermoy, county Cork in the early 1850s. In June and again in December 1850 over 1,800 acres at Ballintlea, parish of Doneraile, the estate of John Curtin the elder and John Curtin the younger were advertised for sale. These lands were held on a lease from Chidley Coote and John and Robert Maunsell to John, Patrick and Charles Curtin dated 1826. The Curtins and Crones were related.
National Archives of Ireland:
Encumbered Estates’ Court Rentals (O’Brien), Curtin, 11 June 1850, Vol 1 (53) & 13 Dec 1850, Vol 4 (37), MRGS 39/001 & 39/002, (microfilm copy in NUIG)