King John of England issued the Assize of Bread, one of the earliest known laws to regulate the quality, weight, and price of bread. The statute aimed to protect consumers from bakers who short-weighted loaves or mixed cheaper ingredients like sand or sawdust into dough. Penalties for violations included fines and public humiliation in the pillory, reflecting medieval concerns about food integrity. This law established a legal precedent for government oversight of the food supply in England.

The Assize of Bread appears in medieval English legal texts and chronicles, reflecting the era's growing bureaucratic literacy. Its provisions were later referenced by social commentators and poets critiquing economic injustice, such as William Langland in Piers Plowman, who condemned corrupt bakers as part of his broader satire of societal greed. The law's enduring legacy in British legal culture provided a touchstone for later Victorian reformers writing about food purity.