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Well, in my timeline I'm working on, the Fourth Crusade is butterflied away, as Henry VI has already taken Jerusalem by that time.

I'm wondering about the effects of not having the Fourth Crusade, particularly on the Byzantine Empire. In OTL, The Fourth Crusade was a severe blow to the Byzantine Empire, and when Constantinople was retaken and the Byzantine Empire restored in 1261, it was a mere shadow of its former glory. So what if the Fourth Crusade never happens? It seems the Byzantine Empire has a much better chance of surviving. I understand the Angeloi were terrible rulers—who can depose them and do a better job ruling? What would need to be done to ensure the survival of the Byzantine Empire?
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