The Lycan's Sin - Chapter 17: The Keepers

... unted, long before the wars even began to terrorize humanity, few humans discovered the existence of witches and shifters and other supernatural entities.

The fact that other entities also resided in this world scared them. The unpredictability of the future was enough to make them want to get rid of the supernatural. So, they schemed and even sacrificed one of them to start a war against the witches and all the supernatural.

Thus, the Greek War of Independence happened.

...