Towerlands is a fantasy setting based on 12th century Germany, specifically Brandenburg (Brenna) in the North March (Nordmark) in 1150. As a fantasy setting, it contains elves and dwarves and many of the usual trappings, grafted onto medieval history. Most of the names are changed to fantasy versions of the originals. The setting hews closely to the real timeline up to 1150, then goes wild. I've also shoehorned-in the Hanseatic League, which ought not to be a power for another 100-200 years, but it is too cool not to include.