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The German Reinheitsgebot (Wikipedia):
The Reinheitsgebot (German pronunciation: [ˈʁaɪnhaɪtsɡəboːt], literally "purity order"), sometimes called the "German Beer Purity Law" or the "Bavarian Purity Law" in English, is a regulation concerning the production of beer in the Holy Roman Empire and its successor state, Germany. In the original text, the only ingredients that could be used in the production of beer were water, barley and hops.
The law originated on 30 November 1487, when Albert IV, Duke of Bavaria promulgated it, specifying three ingredients – water, malt and hops – for the brewing of beer.
Later, in the city of Ingolstadt in the duchy of Bavaria on 23 April 1516, two other dukes endorsed the law as one to be followed in their duchies, adding standards for the sale of beer.
The earliest documented mention of beer by a German nobleman is the granting of a brewing license by Emperor Otto II to the church at Liege (now Belgium), awarded in 974.
Read the whole story on Wikipedia.