There are almost no descriptions of brewing processes in Britain from the medieval period, a reflection of the universality of ale and the universality of the knowledge of how to brew it: similarly “everybody” in the British Isles today knows how to make a cup of tea, and nobody wastes their time writing down a narration covering how to mash the Assam and when to add the milk.
One odd account of brewing “cerveyse”, or ale, was recorded in a late 13th century collection of poems written as an educational guide called the Treatise of Walter de Biblesworth, or, in his own words and spelling, “Le treytyz ke moun sire Gauter de Bíbelesworthe”. Biblesworth, or Bibbesworth, who was born in or before 1219 and died some time in or soon after 1270, was a knight who owned Bibbesworth manor, in Kimpton, Hertfordshire, and he was friends with some powerful people in the England of Edward I, such as the de Lacys, earls of Lincoln, and the de Veres, earls of Oxford. His rhyming treatise is written in the Norman French of the 1200s, with many obscure words. Here is the section on brewing: