It's still a WIP, but the jist of the lore is this: After Constantinople's fall, the Pope calls for a crusade against the Ottomans. Europe, during this time, is heavily disunited, so very few nations are actually able to join, and even then there are still tensions between the members of this new league. That and the members not being fully prepared for a war caused the Crusade to backfire TERRIBLY. The Ottomans are now practically the strongest power in Europe. Feel free to tell me what you think!