The board game Britannia was my first real introduction to English history between the Romans and the Normans. I've spent quite a few hours on Wikipedia trying to figure out who the various “heroes” (Boudicca, Ida, Alfred, Harold, etc.) are that show up periodically, as well as the different factions and regions that I'd never heard of. It's a long game (Axis & Allies length), so beware. We're talking 1-2 hours before new players figure out what's going on and 10 hours or so to finish a game. Anyway, I heartily recommend it!