Getting a crash around year 1250~1300AD, BC3000starting.

[Hippo8085]

Try doing that.

 

[cider]

Well I loaded a a previous save and conquered Baghdad that should change history enough but it still crashes in the exact same round so no idea :-(

 

[Leoreth]

The reason for the crash is probably already part of your game, so if anything you would have to go back further.