Bizantine empire not collapse

The ERE went through many cycles of rise and decline. In general, any time there was a weak emperor (Justinian II, Constantine VI, whoever it was in the 4th crusade), the borders would recede a bit and when there was a good emperor (Justinian I, Alexios I) then the empire would do well.

I would break it down to two things:
- Iconoclasm needs to go, and better unity with the Catholic church. If the west didn't get so alienated from the east in the times around Leo III and especially the mess after the fall of the Isaurians, the Crusaders wouldn't be as inclined to pillage. After all, they would consider them as "fellow Christians", not just "measly Greeks on the other side of Europe"
- Islam needs to be less expansionist, or else direct its efforts elsewhere. More Muslim effort in Spain, or possibly India, would mean less Arabs directed into Anatolia.

Overall, the Byzantines were based off a system that dated back to Augustus Caesar. I can't see that enduring into the Industrial Revolution with any sort of recognisability. Even if it existed in name, it would not be the same empire.

- BNC
 
What could had prevented the collapse of bizantine empire?

That would depend on your point of departure. It also depends on what you mean with "collapse". Is it enough that they just keep a small area around Constantinople or must they still be quite strong. At what moment would you say they collapsed?
 
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