the borough. Losing their place in the national scheme of defence, the burgess cnihts made commerce their principal object under the encouragement of the old privileges of the walled place. Besides the great co-operative strongholds in which many lords had burgesses, there were small boroughs held by a single lord. In many cases boroughs of this "seignorial" type were created upon the royal estates. Out of the king's vill, as a rule the jurisdictional centre of a hundred, there was sometimes created a borough. The lines of division before Domesday Book are obscure, but it is probable that in some cases, by a royal grant of jurisdiction, the inhabitants of a populous royal vill, where a hundred court for the district was already held, were authorised to establish a permanent court, for the settlement of their disputes, distinct from the hundred court of the district. Boroughs of this type with a uniform tenure were created not only on the king's estates but also on those of his tenants-in-chief, and in 1086 they were probably already numerous. Town and manor As noted by Stenton, the practice evident in the Norman period whereby lords living in country manors owned houses in the nearest borough was a continuation of a custom developed earlier by the Anglo-Saxons: Privileges granted to boroughs to encourage settlement near castles A borough was usually, though perhaps not invariably, the companion of a Norman castle. In some cases a French bourg was created by the side of an English borough, and the two remained for many generations distinct in their laws and customs: in other cases a French bourg was settled by the side of an English village. A large number of the followers of the Norman lords had been almost certainly town-dwellers in their own country, and lost none of their burghal privileges by the migration. Every castle needed for its maintenance a group of skilled artisans, and the lords wished to draw to the castle gates all kinds of commodities for the castle's provision. The strength of the garrison made the neighbourhood of the castle a place of danger to men unprotected by legal privilege; and to invite to its neighbourhood desirable settlers, legal privileges similar to those enjoyed in Norman or English boroughs were guaranteed to those who would build on the plots which were offered to colonists. A low fixed rental, release from the renders