Cool - this will be a stupendous serial then. I'll be particularly interested in the latter castles to withstand the rifle etc. Though I am fantasy minded I don't know about much of that stuff. Should be good. Our best castles over here were improved and extended up to about Henry VII or 1450's then they didn't build such nice fancy ones after that. Constantinople's 'great walls' fell to the cannon in 1453 so that was the end of that as far as big walls went.