I always found Westeros to be somewhat similar in shape to Great Britain. Also, there is a wall in northern England called "Hadrian's wall", built by the romans for unknown purposes apparently. The text says the economic viability of constructing and constantly manning a 72 mile long boundary along a sparsely populated border to stop small-scale raiding is dubious. Which is similar to something I believe Lord Commander Mormont says "You don't build a wall 700 feet high to keep out raiders." http://en.wikipedia.org/wiki/Hadrian%27s_Wall Westeros being England would further support the theory about the english king reference with Aegon the Conqueror.