Outlined

Situated just off the E shore of Lough Derg on the River Shannon. A small circular stone-built island (approx. diam. 30m) which appears to have been artificially constructed with loosely piled rubble creating a stone cairn. A cashel (TN019-034005-) was constructed on top of the crannóg by Conchobhar Uí Bhriain [Conor O'Brien], King of Thomond, in the 12th century (Westropp 1911-12, 211) and was later refortified with a tower house and bawn (TN019-034001-) in the late medieval period. A stone causeway (TN019-034004-) which appears to have been recently widened and enlarged, connects the E portion of the crannóg to the mainland. Described by Cairns (1987, 11) as the site of a crannóg. The townland is referred to as Cahirconner in the Civil Survey (Simington 1934, vol.2, 160). The castle island is depicted on the 1654-7 Down Survey map of Owny and Arra barony (NLI, Ms 721). This monument is subject to a preservation order made under the National Monuments Acts 1930 to 2014 (PO no. 4/2001). The above description is derived from 'The Archaeological Inventory of County Tipperary. Vol. 1 - North Tipperary' compiled by Jean Farrelly and Caimin O'Brien (Dublin: Stationery Office, 2002). In certain instances the entries have been revised and updated in the light of recent research. Compiled by: Jean Farrelly and Caimin O'Brien Revised by: Caimin O'Brien Date of revised upload: 21 February 2020