Santiago Capulet V

After the Conquest War ended, the focus of the Empire officials and the Imperial family is to restore the reputation of the Empire

In a way, it is to launder the image of the Empire to a virtuous one. The stronger one is, the more respectable they have to become. 

There is no need for the Empire to haggle stuff with the other lesser kingdoms and it is better to exercise influence over these kingdoms in a subtler way 

War after all is taxing. 

At times it is profitable. But war also burns a lot of gold from the supplies to the weapons, all of it requires gold.

So, the policy of the Empire to the former territory of Vern is to slowly integrate those people to the Empire, focusing on winning the hearts of the people there so that they would lean on to the Empire instead of trying to forcefully conquers them

And there is no reason for the Empire to attack those two kingdom that occupied Vern.