According to Wikipedia History of Beers, The use of hops in beer was written of in 822 by a Carolingian Abbot. Again in 1067 by Abbess Hildegard of Bingen: "If one intends to make beer from oats, it is prepared with hops." ... Hopped beer was perfected in the towns of Germany by the 13th century, and the longer lasting beer, combined with standardized barrel sizes, allowed for large-scale export. The German towns also pioneered a new scale of operation and a level of professionalization.
A History of Hops states - "So it was in Germany. In Cologne, brewers who wanted to use hops ran afoul of the archbishop who held the monopolistic rights to gruit. But the hop flourished in spite of such roadblocks, and its preservative quality made the brewing, storing and eventual shipping of the German lager style possible.
In Holland in the 1300's, the Dutch developed a taste for hopped German beer from Hamburg, much to the dismay of Dutch brewers of gruit beer. Over the protests, prohibitions and high import duties imposed by the nobility, Dutch drinkers imported hopped beer, then the hops to brew their own."
And A Short History of Hops says - "The earliest references to hop cultivation are during the 8th and 9th century AD from the Hallertau district in Germany. Although it is not clear whether these hops were used in brewing, by the 14th century the Dutch had developed a taste for hopped German beer. "
German Beer History
It's a beginning at any rate. :D
For further research a few of the sources are as follows:
- A History of Brewing by H.S. Corran (1975)
- Brewed in America by Stanley Baron (1972)
- One Hundred Years of Brewing, published by The Western Brewer magazine (1903)
- The Brewing Industry in England, 1700-1830 by Peter Mathias (1959)
- New World Guide to Beer by Michael Jackson (1988)
- Wines and Beers of Old New England by Sanborn C. Brown (1978)