mats vassaled everyone in his path
did you notice his bb levels at all times? i would start there...
i was about to do that, when that event popped up with rebellions all over anatolia, then 1 city falls and a month later puff nation taking it all, i belive matty should have given me a chance to atleast fight the rebels and not expect me to have 40k troops in anatolia at all times to fight some 60k in rebels that popped up.
that not only costed me the vassalization of hungary, croatia and ragusa, due to the collapse of my income and the incapability of fighting on in the balkans to conclude the sieges and get them vassalized, but also costed me the vassals of georgia, and later on armenia.
so ye that event pretty much ruined byz.