Weihenstephan Abbey (Kloster Weihenstephan) was a Benedictine monastery in Weihenstephan, now part of the district of Freising, in Bavaria, Germany. Brauerei Weihenstephan, located at the monastery site since at least 1040, is the world’s oldest continuously operating brewery.
The Weihenstephan Brewery can trace its roots at the abbey to 768, as a document from that year refers to a hop garden in the area paying a tithe to the monastery. A brewery was licensed by the City of Freising in 1040, and that is the founding date claimed by the modern brewery. The brewery thus has a credible claim to being the oldest working brewery in the world. When the monastery and brewery were secularized in 1803, they became possessions of the State of Bavaria.
The brewery produces a range of pale lagers and wheat beers including Weihenstephaner Weissbier, a 5.4% ABV weissbier which is available in filtered (Kristall) and unfiltered versions. The strongest beers the brewery produces are Infinium (10.5% ABV), Vitus (a 7.7% ABV wheat beer), and Korbinian (a 7.4% ABV strong lager or bock).
Oddly enough, the world’s second-oldest working brewery is just a short car journey away. Weltenburg Abbey lies 60 km north, near Kelheim, also in Bavaria. It began brewing beer just after Weihenstephan, in 1050 AD.
According to Wikipedia