This fragment of wall is about all that remains of Roche Castle, which wasn't a castle at all, but a manor house of circa 1300. It appears that the ruins were not referred to as a 'castle' until the mid 18thC.
Uploaded to Geograph by Gordon Hatton on 3 September 2014
Photo © Gordon Hatton, 3 September 2014. Licensed for reuse under this Creative Commons licence