The Liber is the longest of the local histories produced in England during the 12th century .
Liber contains a description of the royal chancery , which might be the earliest evidence for the existence of that office in the Anglo - Saxon kingdom .
The Liber is the longest of the local histories produced in England during the 12th century , and it contains a description of the royal chancery , which might be the earliest evidence for the existence of that office in the Anglo - Saxon kingdom .