Don King is used to being disappointed by his Heirs. He did not get along with his Royal daughter, and his Royal son tried to have him assassinated. So after both of his children were croaked, he decided to change how his kingdom was organized and simplified things. He dropped some of the fru-fru of nobility and kept what was useful. He appointed a minor Noble named Caesar Borgata as his Chief Warlord and Heir. Don King said he did so because Caesar earned it. At first, Caesar seemed much better qualified to rule than either of Don's children had been. He was a very capable Chief Warlord and earned the respect of Transylvito's Warlords and troops on his own merits and accomplishments.
However, following the Battle for Gobwin Knob, Don King again started to rethink the importance of royalty. Stanley claimed a titanic mandate, and that royalty was obsolete. Especially after the croaking of Queen Bea of Unaroyal, Don placed much greater importance on royalty. Unfortunately, he had a low-ranking Noble as his heir. The close relationship Don and Caesar enjoyed before the Battle for Gobwin Knob became divided by disagreement. Caesar was opposed to Don King bleeding all of Transylvito's resources to Faq. Transylvito was threatened on all sides because they could no longer defend themselves against kingdoms like Carpool who previously posed no threat.
In Don's view, Caesar didn't appreciate the magnitude of the problem posed by Gobwin Knob. Don was probably also aware that Caesar felt a bitter antagonism towards Queen Jillian of Faq, despite the fact that Don had made it clear Jillian played an important role in his plans. Don rethought the wisdom of downplaying the importance of royalty and appointing Caesar heir designate. He decided to pop a new Royal Heir to take Caesar's place. Don had not yet communicated with Caesar whether he would also be replaced as Chief Warlord. Caesar seriously suspected that Don tried to have him croaked by sending him with a small force on a suicidal attack against a heavily defended Chocula. Don himself openly hoped Caesar would be croaked in the near future on his increasingly dangerous missions.
Caesar said that he and Don King used to understand one another; they could talk and had a good relationship. They now had some fundamental disagreements, which destroyed the understanding. In particular, Caesar was opposed to Don's policy of rapidly building the power of Faq, because it left Transylvito exposed to attack, losing cities and good people such as Broadway Tony and other Warlords. Caesar grew to resent and despise Faq's Queen Jillian because of the investments being made for a woman he thought to be crazy and untrustworthy. Don believed that Caesar lacked the finesse and subtlety necessary to rule. He therefore concluded that although Caesar might still have the qualities needed to be a very effective Chief Warlord, he was no longer a suitable heir. Don King said that he was planning to "retire" Caesar to manage a quiet level 2 city somewhere far away, but Caesar made it clear he felt that was an unjust reward.
With the order to pop a third Royal heir to replace him, Caesar felt betrayed by his King; he had already seriously suspected that he was set up when he was sent to retake Chocula. If he hadn't fought so well, he would have croaked the turn before Don King announced the creation of a new Royal heir. Also in a time where their defenses were stretched so thin, the popping of a Royal heir required vast resources and production capacity that Caesar thought could be far more wisely expended.
Don King considered simply disbanding Caesar but decided that course was unacceptable, because the loyalty and duty of all units on his side would suffer. If Caesar fell in battle it would be a different story, but Caesar is a very tough combatant.
After Parson Gotti stumbled into the Transylvito portal, and the threat of Transylvito being attacked either by Faq or Charlescomm grew, Caesar's relations with Don became even more tense. The chief warlord made some orders to his king, including not talking to Gotti. At the time the Don found them sound and, as the situation developed, convinced Caesar to lift them. Don King was almost ready to disband Caesar at many points of time and the issue reached its peak when Caesar gave orders to his king again forbidding any interaction with Vanna. He didn't change his mind even after spending a night locked next to Vanna, having to listen to her side of the story.
The relationship came to an abrupt conclusion when Bunny croaked Don King while Don was literally in the midst of disbanding Caesar.