The Dieppe gate, which is also that from the town of Arques, was in 1433 called “La Première Port du Bel de Château d’Arques,” and, as such, was the subject of a tenure by castle guard, the tenant being bound to defend it for forty days in time of war. From this gate the approach ascends to the castle, having the curtain-wall as a protection on its right. Where this wall approaches the castle, at either end, it is covered by a broad ditch, continued down the slope. A flint wall may be of any age, but the remains of the gates, which a few years ago showed round-headed arches, prove this inclosure to be of early date, probably one of the earliest additions to the castle, and made by Henry I. No doubt, before the construction of the outer ward, the wall of the Bel was produced so as to unite with those of the castle. M. Deville has discovered a part of this wall worked into the great curtain of the outer ward, which lies in its line, and may still be seen. Looking to the history of this castle, and to the evidence afforded by its remains, it seems probable that the keep is the oldest part of the masonry, and the work of the Conqueror’s uncle, Guillaume d’Arques, between the years 1039-1043, and it is supposed to be one of the earliest, if not the earliest, of the rectangular Norman keeps known. The chronicle of Normandy, cited by M. Deville, says of William, “Si fist faire une tour moult forte, audessus du chastel d’Arques”; as though there had been an earlier castle, which the aspect of the earthworks renders highly probable. To the Conqueror or his immediate successor must be attributed the _enceinte_ of the inner ward and the formation of the galleries. The ditch may be much older than the western masonry. The inner ward no doubt formed part of the original plan, and it is only the occasional appearance of round turrets upon the wall that leads to the opinion that any time intervened between the actual construction of the keep and of its surroundings. The southern entrance, with its gate and two flanking towers, and one or two of the other mural towers or buttresses, seem to be additions, but of the Norman period, probably the work of the Conqueror’s son, King Henry I., who, about 1123, seems also to have enclosed the Bel. Robert de Thorigny—called also “Du Mont,” from his abbacy of Mont St. Michael—a Norman chronicler of the twelfth century, says that King Henry I. “fortified admirably the castle of Arques with walls and a tower.” This has been held to show that the whole structure was the work of Henry, who reigned from 1105 to 1135, and the extreme boldness of the buttresses and superincumbent constructions of the keep no doubt favour this view; but, as M. Deville remarks in the same passage, similar reference is made to Gisors, Falaise, and other castles, known to be of earlier date.