This is a critical edition and translation of the legal treatise by Philip of Novara who was writing ca. 1250. Philip was a knight with fiefs in both the Latin Kingdom of Jerusalem and the kingdom of Cyprus. He was respected as the best pleader of his day in the High Courts of these two kingdoms. His Livre de Forme de Plait explains how to plead and discusses the customary law as administered in the royal court, giving important insights into the outlook and assumptions of the fief-holding classes in the mid thirteenth century.