The Goddess Seil

"From what I know, a few thousand years ago the Holy Church of Seil founded the Principality of the Goddess Seil. No one actually knows when the holy church had formed but they basically formed a large army they called the Holy Knights of Seil, they invaded a small kingdom and took it over for themselves then used its people to build a massive castle out of the side of a mountain. They had basically enslaved the citizens and killed all those who went against their faith. From there they spread out to the surrounding kingdoms building up a mighty force. Only those kingdoms that took the church's religion as a state religion were spared but were still basically under the rule of the church itself. Unfortunately, Selinicia is also one of them.