 It is referred to as a 'tower' located on Carrigaknubber Rock as per the 1842 surveyed OS map and named as 'Aghavrin Castle' in both the Ordnance Survey (OS) name book (c. 1840) and the 1901 surveyed OS map.The OS name book describes it as in the southern part of Aghavrin about north-east of the boundary with Rockgrove (townland).Locally, it is nowadays referred to as 'Crooke's Castle.'