Louis XXIV
Le Roi Soleil
While Dachs does know a great deal, he has his gaps, just like any of us. Try asking him about Classical Indian History or Early Modern French History, for example.
Well, I took this goal to be aspirational rather than a belief that he could realistically and easily do it. I think his point was he should try to fill as many gaps in knowledge as possible.
Back closer on topic:
Does anyone know any good books covering the Byzantine Empire. I guess to make some futile attempt to narrow it down, I don't really care about much beyond the Fourth Crusade (yeah, I know that doesn't help much).