A good place to start is here: http://geacron.com/home-en/?&sid=GeaCron196559
During this time period, not every nation in the world was civilized (technology advances in warfare, social, etc), thus I do not believe everywhere should be maps or make them colonizable wastes with very little bonus associated.
The further back in history we go, especially with nonEuropean parts of the world the more difficult it becomes to research accuracy since so little is actually known. I wish you good luck.
From looking at it right now, I think you have to rework your dimensions for the map. Currently, it looks rather warped in a bad wap.