What date does the map of Germania Magna represent? I see that the Agri Decumantes are marked as 'Allemani' which implies that this was after 260 ce when the limes were abandones, the border of the Roman empire fell back to the actual course of the Rhine and Danube, and the Allemani Confederation was formed - does the text accompanying that map give a more precise date?

I am interested to know which Germanic peoples were in that area in the first century ce, before the limes pushed forward.