We have, then, to recapitulate, as the constituent parts of Hereford Castle, an oblong space, with the river on one side, and high banks and ditches on the other three. One end was cut off from the rest, and had its proper ditch, more or less circular, and within it a conical mound, with a table summit, and upon it a shell keep, with some kind of central tower, probably an addition. At the base of the mound, within its ditch, was a second wall, many sided in plan. The lower ward, no doubt, had its walls along the summit of the earthworks, and these probably were low, by reason of the height of the bank and the depth of the ditch beyond. There was a gatehouse at the land entrance at the north-west angle, and a water-gate at the south-western, where also was the passage between the two wards. Very likely there was a postern at the south-eastern angle, where is now a footway. There is a general resemblance, as regards the mound and bank, between these arrangements and those at Wallingford, Wareham, and Tamworth, and with what is related of the castle of Worcester. HERTFORD CASTLE. The Castle of Hertford not only is of high antiquity, but the date of its foundation is on record. The Saxon Chronicle relates that in the year 913, Edward the Elder, son of Alfred, threw up two Burhs at Hertford, one at Martinmas, on the north bank of the river, and, later on, one on the south bank, between three of the rivers which here unite. The former of these works has long been laid low, and no trace of it is visible, but the latter has been preserved by its incorporation into the later castle. The mound, standing on the edge of the river Lea, is indeed shorn of its original dimensions, but it remains, and attached to it is the base court with its exterior ditch, once of great breadth and depth, the invariable accompaniment of the mound, and with it constituting the Burh. [Illustration: Hertford] Edward’s Burhs may have been preceded by an earlier earthwork, for Hertford is reputed to stand on the site of a chief town of the Trinobantes, the British occupants of the district north of this part of the Thames. The Britons, however, if they here established a stronghold, are more likely to have placed it upon one of the adjacent heights, where are several excellent positions for an entrenchment. Probably the existence of a British settlement in a neighbourhood so well protected by its watercourses attracted the invading settlers, for here the East Saxon kings are said to have had a residence, and to this place Archbishop Theodore, consecrated in 668, convened a synod of the national Church in 673.