Lukan
The transition from the previous ruler to the current ruler was going smoothly. The Lionax Kingdom's army gave up just like that when the Tang Empire came to take over the kingdom. Of course, there was no resistance because those who tried to resist had been eradicated.
Yes, six noble houses tried to resist as they were not willing to be under Tang Shaoyang's rule. One Archduke, two Dukes, and three Counts were conspiring together to have a siege battle. They were brave enough to fight back because they gained support from the civilians. The civilians willingly joined the army to fight.
There was one reason why these noble houses were willing to put up a fight. Because the news of King Emerson and the two Guardian's deaths were spread out like a wildfire. Within one night, everyone in the kingdom knew they had lost their King and Protector in a war. The Royal Family was left with nothing but a princess.