It's mostly a result of a lot of varying sources, I tried to do a nice middle ground between nationalistic sources from a plethora of different peoples. The biggest issue was migration of a couple of tribes during the period of the crusades most notably in the Prussian and Highland regions. The city names I tried to find the closest areas to where the tribal cities were; a couple of sources that were in Lithuanian (that I used google translate for) stated to varying degree which cities existed, so I decided to add all from all sources as to not dilute any sources. I realize a couple may not have existed but it's better to be safe than sorry. Also it looks better to have more cities within the region to show that the tribal states weren't by any means less developed than the crusader or larger states around them.As to why I picked this date, I wanted to show that the Baltic wasn't just a "savage land" that was conquered and Lithuania 'appeared out of nowhere'. Unfortunately in the west most people have no idea about the Baltic tribes or how the Northern Crusades cascaded to having the Teutonic order and Lithuania as the two major powers in the region. There are a million different wank maps over the Teutons during this period as well which made me shy away from making another copy of whats already out there. Though I do agree a supplementary map might be necessary to show how the territory changed... Perhaps I will make one once compiling the final draft for the atlas itself.Thanks again for all the input! I do appreciate comments such as these because they help me fix future maps as well