I found this in your FAQ : If a faction lost it's last settlement then it changes into hording, that means troops are spawned somewhere and the faction is looking for a new capital. The hording process freezes the game 1...30 minutes, then it continues.
So I'll try to wait for 30 mins or so...
What actually surprises me is that it's the Mongols that hang. Never thought they have a chance to get eliminated because , hell , they're the Mongols. Apparently anything is possible in DLV.Anyways , wish me luck...
EDIT : Had to wait for 21 minutes...next turn no more probs