Among the legislators of the medieval English Church John Pecham, archbishop of Canterbury, 1279–92, is remembered chiefly on account of canons published in two councils early in his pontificate, at Reading in July-August 1279 and at Lambeth in October 1281. His successor, Robert Winchelsey (1294–1313), less celebrated for his laws, none-the-less is assigned by Lyndwood, the fifteenth-century canonist, nine chapters of the Provinciale. The ‘Winchelsey’ documents and some others described in medieval manuscripts as ‘Statuta’ or ‘Constitutiones’ or ‘Decreta’ of one or other of the two archbishops cannot be immediately or surely connected with any known provincial council. They include texts on questions of almost daily occurrence to medieval archdeacons and parochial clergy: about the calculation of tithe, the duties of stipendiary priests, the obligations of the laity for church repairs. Lyndwood glossed many of them. Modern students of history and canon law commonly cite them. It is, therefore, of some importance to establish the degree of credit which may be allowed to the ascriptions. This study will consider the evidence of the manuscripts and will aim at sorting the genuine statutes from the spurious and the dubious. Some of each kind will be found. The enquiry may not only help to determine the nature of these particular documents, but also may reflect light on other doubtful legislation and illustrate the ways in which laws were framed and customs established in the English Church in the later Middle Ages.