A systematic medieval legal manual that explains how pleas are classified and handled in the royal courts, detailing the distinction between criminal and civil matters, the roles of royal and local officers, and the preliminary steps and writs required to bring disputes before judgment. It outlines procedural formalities such as essoins and pleadings, describes common forms of action and remedies, and gives practical guidance on adjudication, enforcement, and customary practices governing property, obligations, and penalties. The work is instructional in tone, intended to guide the administration and application of customary royal justice.