I don't mean the Fourth Crusade necessarily, but moreso for example the Latinization efforts the crusaders undertook when establishing their kingdoms in Outremer a hundred years prior. The distinct ethos behind an undertaking like the Crusades is also very interesting, since it definitely breaks with the way people conceived of war and government in times prior, and it is interestingly something that carried over into secular times, if you think about the way George W. Bush, Franklin Roosevelt or even Hitler propagandized their wars.You hear an awful lot about 1204 in Orthodox circles - fair - but very little about 1182. Those nuances, eh?
Yes that was a most unfortunate event of the 1204 "crusade" It had always been there but it was amplified 1000 percent after that. Basil II attempted to squelch things and crushed the Phocas family for the most part.Byzantium was taken down mostly through sedition and internal strife among its oligarchy. United it would have never fallen to the Ottomans.
Family dynasties emerged and created separatist groups that eliminated central power.
Some of those groups were the Comneno-Ducae, Comneno, Andronicus, Angeli, Lascarids.
It's an unfortunate lesson in united we stand, divided we fall.