The pictures shown in the Bayeux Tapestry agree very well with the description given by a 12th-century writer of the castle of Merchem, near Dixmüde, in the life of John, Bishop of Terouenne, who died in 1130. "Bishop John used to stay frequently at Merchem when he was going round his diocese. Near the churchyard was an exceedingly high fortification, which might be called a castle or _municipium_, built according to the fashion of that country by the lord of the manor many years before. For it is the custom of the nobles of that region, who spend their time for the most part in private war, in order to defend themselves from their enemies to make a hill of earth, as high as they can, and encircle it with a ditch as broad and deep as possible. They surround the upper edge of this hill with a very strong wall of hewn logs, placing towers on the circuit, according to their means. Inside this wall they plant their house, or keep (arcem), which overlooks the whole thing. The entrance to this fortress is only by a bridge, which rises from the counterscarp of the ditch, supported on double or even triple columns, till it reaches the upper edge of the motte (agger)."[231] The chronicler goes on to relate how this wooden bridge broke down under the crowd of people who were following the bishop, and all fell 35 feet into the ditch, where the water was up to their knees. There is no mention of a bailey in this account, but a bailey was so absolutely necessary to a residential castle, in order to find room for the stables, lodgings, barns, smithies and other workshops, which were necessary dependencies of a feudal household, that it can seldom have been omitted, and the comparatively rare instances which we find of mottes which appear never to have had baileys were probably outposts dependent on some more important castle.