The story
The "Fürstliche Brauhaus zu Oettingen" (Prince's brewhouse at Oettingen) was bought in 1956 by the Kollmar family and renamed "Oettinger Brauerei GmbH".
Oettinger Group claims that its beer is brewed in accordance with the Reinheitsgebot.
From Wikipedia’s article on Oettinger Brewery, shared under CC BY-SA 4.0.4