You send the Army to bring order to streets of Ceodwellian cities once more.
1150 AD, Summer
After many years, Thaud Owalynn finishes his illuminated tome of history: "Yoean Dynasty: From Chaos, Enlightenment".
Per your instructions, he has concentrated on highlighting your dynasty's reforms and the unification process of the regional peoples under your banner. The 180+ pages manuscript has many illustrations, representing banners, your precedessors, and other important figures and events.
Held in high regard by historians of next centuries, of course it will come under attack in the age of Internet as being 'book of propaganda and justification of oppression of cultures and nations', but why bother yourself with historians of the next millenia? Pfft!
1150 AD, Autumn
Another gigantic battle took place just southeast of Bloodpeak Mountains, involving almost twenty thousand of troops (half each for both sides), and the casualties amounted to 3/4ths of the total number, this time mostly on Agaresian side however.
Finally, you get a reply from King Tetan I.
In the letter, he writes that the current circumstances has made him choose between honoring the deal, and spending the silver for the good of Eldrican peoples, and of course, like any sane leader, he has chosen the latter.
There's no mention whether this is temporary, and when and if and how he will honor the deal in the future.
A) Insolent, honorless, oathbreaking cur! Sound the horns of war!!!
B) Fine, we can let him go away with it.
C) Oh no you don't. Time to send another letter, with delegates, guards and some threats attached to it!