Reinheitsgebot

Reinheitsgebot means "Purity Order" in German

This was a Bavarian Beer Purity Law, signed to restrict the ingredients used in brewing beer. It was proposed in 1487 AD and passed in 1516 AD.

The law allowed breweries in Bavaria to use only water, barley, and hops for beer. Note that all other brewing grains, such as wheat and rye, were prohibited. It was later ammended to allow yeast. Bavaria is now a southern state in Germany.

Reinheitsgebot is no longer an active law. This has allowed new styles of German beer to become significant, such as Weizen.