Republics in Quarth

[Gunburned]

Several times playing as Xaro Zo Daxos and I've had a game over. Just plain old game over, my character doesnt even die. My only suspect is that my Overlord, the King revokes my city in the capital which is also the capitol of the Republic. AI seems to be doing this quite randomly. Maybe making the cities un revokeable?
Anyone else having this problem or know a way around it?

 

[Aerrae]

Revoking merchant republic titles leads to a war with the republic at least in the case of human liege. Which start date are you playing from?

 

[Gunburned]

Clash of kings start date. Wish i knew what was causing this, I realy wanted to play with the merchant repulics over there