lol, this is just a joke because I do NOT believe in the Aerys + Joanna = Tyrion theory, but Joanna was a Welsh princess (I think a bastard daughter of King John) who was unfaithful to her husband, Prince Llewelyn. An amazing trilogy by Sharon Kay-Penman details the historical fiction concerning England and Wales King John-onward. The first is Here Be Dragons, if anyone's interested. this thread is fantastic, by the way!