I believe that the coastal town is Caernarfon and the Fort is Segontium. Can anyone confirm this for me? I cannot find any reference to the Forceful river, which makes makes me dubious about my answers. Many thanks Jane
The 'Forceful River' led me to Lancashire and Cumbria - fort Galava but I ignored this because of the later clues.
Just for completeness though - I got the second poet (with difficulty) as R. Williams Parry but I can't get the first one (Old Memories). Anyone got it?