2nd oldest castle in the UK

I originally sat down to write about the nearby church, but felt like these ruins deserved a post all of their own and it sets the history for my next post. What is the oldest castle in the UK? Well I guess it depends how you define a castle, the ancient hill forts like British Camp at Malvern and others probably qualify, but if you want a real castle the way most of us think of one, with a stone walls and keep it gets even more complicated. GoogleAI (spit, hiss) tells me its Chepstow Castle, built in 1067 which shows immediately AI is not to be trusted. It does later (as do other sites) make a case for Ewyas Harold Castle (1048) in Hereford, but digging a little deeper, that site it doesn’t really have anything left beyond earthworks. There is however, another castle of a similar vintage that may just about have the stronger claim. Or perhaps this is just the 2nd oldest castle. Most of what we think of as castles were built after the Norman invasion of 1066. However, prior to that…