E is for Eleanor

I put a call out on Facebook and Twitter for help with today's letter and as soon as I hit "post" my brain went: hello? Your daughter's name starts with E. However, I'm sure you guys have heard enough about my Eleanor, so how about her namesake?When I was a lot younger, my parents took me to Snowdonia and showed me around several of the castles which used to form the so called 'iron ring'.