15 Extra Map language development over the centuries Once it spread as far as lake Constance: the retreating Raeto-romansh language between 700 (red) and 1200 (orange) (in German).Map: Raetian Museum + The development of Raeto-romansh in Grisons since 1860 (in German).Map: Swiss national census 2000, BFS, © BFS, ThemaKart, Neuchâtel 2005 + There are currently five different dialects in the Raeto-romansh language territory (in German).Maps: © BFS, ThemaKart, Neuchâtel 2005 + The development of Italian in Grisons since 1860 (in German).Maps: Swiss national census 2000, BFS, © BFS, ThemaKart, Neuchâtel 2005 + The development of German in Grisons since 1860 (in German).Maps: Swiss national census 2000, BFS, © BFS, ThemaKart, Neuchâtel 2005 +