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In 1516 the Bavarian dukes Wilhelm IV. and Lduwig X.agreed on a legal regulation, which is the oldest consumer act in force. At that time, a price war between bakers and breweres emerged and as a result, herbs, root vegetables, mushrooms and animal products have been mixed into the beer. This lead to an enactment, which is known as Reinheitsgebot since the beginning of the 20th century. According to this enactment, beer was only allowed to be brewed with barley, hops and water. The regulation did not mention yeast, an ingrdient, which was still unknown at that time.[1]
  1. Tim Webb & Stephen Beaumont - Die Bier Bibel; ISBN: 978-3-86690-310-4