CCCC MS 84, dating from c. 1450, contains fifteenth-century copies of William of Mont Lauzun's (d. 1343), Sacramentale and Gloss on the Constitutiones Clementinae (Lectura super Clementinas) together with a number of ecclesiastical constitutions from the province of Canterbury and other material of interest to churchmen such as the Articuli cleri of 1316 and a copy of the writ Circumspecte agatis. Clearly it was this material relating to the history of the governance of the Church in England that interested Parker about the manuscript. The provenance of the codex is unknown.