A while ago, I started a game out there to test out some ideas for a Roman version of Dux Brit. I ended up converting it to an AD&D 3.5 game. Its actually survived quite a while and I have a couple of dedicated players who are pushing on.
The story is set on the Roman Limes wall in Germania Superior. The players are Auxilia troops stationed at the fort at Saalburg. The players have been dispatched as an esploratori unit to investigate some strange happenings north of the wall. A barbarian migration had begun and is forcing the local tribes out of their homes and across the wall.
Since it is AD&D, it departs from history at this point but it has been fun. If you are interested, stop by and take a look. RPOL.net