Ravennan politics are an absolutely abysmal mess. Ever since the rise of The Inquisition and The Cult of Zelial in the kingdom, the power of the king has become basically non-existent, with an unruly populace and unwilling governors. The only thing keeping some mildly popular duke from launching a coup against the monarchy is the support of the Inquisition, and the fact no one wants to actually rule the smoldering trash fire that is Ravenna. The king only holds power in the central territories of the nation, the outer provinces are only part of Ravenna in name alone, some small towns going decades with minimal interaction with any sort of government influence.
People have used this to their advantage, trade barons and crime lords taking up border towns as their own, enforcing their illegal rule with mercenaries and paid goons. The government knows about this, but simply isn't strong enough to definitively destroy any of the independent warlords on their own without the others falling upon them like vultures. They do try and attack any warlord that grows too ambitious or too powerful.