That could certainly be interesting. Deviate from history, and see (A guess of) how events are impacted by the change.
That would be extremely hard on the Dungeon Master though, especially if one is looking for accuracy.
Edited: daishain on 17th Apr, 2017 - 2:05pm
True, it would be a guess of what the outcome would be, really pure speculation… but it sure could be fun. Well, at least to me.