The Trinity Of Powers

This thin balance of power that was mostly tilted towards the Royal family's favor was actually maintained by a third party… The churches.

They were the one wild card that could not be controlled by either the military nor the nobles. Their doctrines were followed by millions, including those in the nobility and the military, along with the commoners of course, who were the majority.

The church was free from most of the influence of the kingdoms, and they even had to pay a tithe to the churches. While this made it seem like the Church held the supreme power, they were still limited by the tithes given by the commoners and the kingdom.

If the kingdom and its nobles collectively decided to stop paying tithe to the church, they may not be able to keep all their clergy working for long. Even with Faith, there was little a person could do.