The
Grey League (, , or ), sometimes called
Oberbund, formed in 1395 in the
Vorderrhein and
Hinterrhein valleys,
Raetia. The name Grey League is derived from the homespun grey clothes worn by the people. The league became part of the canton of
Graubünden. The Grey League allied itself to the two other powers of Raetia in 1471, forming the
Three Leagues. It was also an associate and ally of the Swiss Confederation and played a role in the build up to the
Thirty Years' War.