At last, I have escaped Revaire!
I'm not sure if this is a bug, but even though I made peace between all countries (golden age etc), the summit was still remembered as when everything changed for the worse.
Viewing post in Bug Reports and Errors
I'm not sure what counts as a bad result? One example where I got the "worse" descriptor:
-Arland and Jiyel entered an era of peaceful exchange
-Hise/Corval naval merchantry
-Wellin and Skalt in friendship and alliance
-Rebellion won with many allies, new peaceful age
If this still counts as a bed outcome, Katyia has unrealistically high expectations...
Looks like you got the peace ending for Arland/Jiyel, instead of the good ending or legendary ending.
So you just *barely* missed out! But you are right that does seem a bit harsh of a line for a very good overall outcome. I'll add adding more variation there to the list of things to change post bug fixes.
(And yeah, who can live up to that Katyia chick anyway.)
edit: I looked into it just now and it turns out there is an all peace line - I just forgot to account for an all peace or better + good rebel , so it's fixed <3