Brewing Time Reinheitsgebot German Beer Stein .9L LiddedReinheitsgebot or the "German Beer Purity Law" in English is a series of regulations for the brewing of beer in the former Holy Roman Empire. The decree known as the Reinheitsgebot, issued in Ingolstadt in 1516, had three aims: to protect drinkers from high prices; to ban the use of wheat in beer so more bread could be made; and to stop unscrupulous brewers from adding dubious toxic and even hallucinogenic ingredients as preservatives or flavorings.