 According to English Heritage, "exactly how barns in general were used in the Middle Ages is less well understood than might be expected, and the subject abounds with myths (for example, not one of England's surviving architecturally impressive barns was a tithe barn, although such barns existed)".There are surviving examples of medieval barns in England, some of them known as "tithe barns".English Heritage established criteria to determine if barns were used as tithe barns.