Great animated map of shifting borders over at LiveLeak.
Love this sort of stuff.
What I particularly like about this map is that
it includes all of Europe and the Mediterranean, so you see what's
happening in England and France in context with what's going on in
Anatolia, for example, and North Africa. When we study history it often
becomes necessarily narrowly focused on one region, a series of major
events, but at the cost of context.