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Rh assizes, whence the procedure is often called the assize. In England the earliest of these assizes known to us appears in 1164 in the Constitutions of Clarendon, followed shortly by applications of this mode of trial to other kinds of cases. In Normandy repeated references to similar assizes occur some years earlier, between 1156 and 1159, so that as far as present evidence goes, the priority of Normandy in this respect is clear. Moreover, Normandy offers two pieces of evidence that are still earlier. In the oldest cartulary of Bayeux cathedral, called the Black Book and still preserved high up in one of its ancient towers, are two writs of the duke ordering his justices to have determined by sworn inquest, in accordance with the duke's assize, the facts in dispute between the bishop of Bayeux and certain of his tenants. The ducal initial was left blank when these writs were copied into the cartulary, in order that it might later be inserted in colors by an illuminator who never came; and those who first studied these documents drew the hasty conclusion that they were issued by Henry as duke of Normandy before he became king. It was not, however, usual for the mediæval scribe to leave the rubricator entirely without guidance when he came to insert his initials, but to mark the proper letter lightly in the place itself or on the margin, and an attentive examination of the well-thumbed margins of the Bayeux Black Book shows that this was no exception to the rule, and that in both the cases in question