Duke Wilhelm IV of Bavaria adopted the famous beer regulation later known as the Reinheitsgebot, limiting beer ingredients to water, barley, and hops. Yeast was not listed because its biological role was not yet understood.

The Bavarian Reinheitsgebot, or beer purity law, became a cultural touchstone, influencing poets to explore themes of identity and nostalgia in relation to food and drink. This regulation not only shaped culinary practices but also inspired literary reflections on community and tradition.