But unfortunately for this theory, there is some evidence of the raising of mottes at an earlier period in the 10th century than the accession of Fulk Nerra. Thibault-le-Tricheur, who was Count of Blois and Chartres from 932 to 962, was also a great builder, and it is recorded of him that he built the keeps of Chartres, Chateaudun,[189] Blois, and Chinon,[190] and the castle of Saumur; these must have been finished before 962. Now there was anciently a motte at Blois, for in the 12th century, Fulk V. of Anjou burnt the whole fortress, "_except the house on the motte_."[191] There was also a motte at Saumur;[192] and the plan of the castle of Chinon is not inconsistent with the existence of a former motte.[193] These instances seem to put back the existence of the motte castle to the middle of the 10th century. We know of no earlier claim than this, unless we were to accept the statement of Lambert of Ardres that Sigfrid the Dane, who occupied the county of Guisnes about the year 928, fortified the town, and enclosed his own _dunio_ with a double ditch.[194] If this were true, we have a clear instance of a motte built in the first half of the 10th century. But Lambert's work was written at the end of the 12th century, with the object of glorifying the counts of Guisnes, and its editor regards the early part of it as fabulous. That Sigfrid fortified the _town_ of Guisnes we can easily believe, as we know the Danes commonly did the like (see Chapter IV.); but that he built himself a personal castle is unlikely.[195] It is the more unlikely, because the Danes in Normandy do not appear to have built personal castles until the feudal system was introduced there by Richard Sans Peur. The settlement in Normandy was not on feudal lines. "Rollo divided out the lands among his powerful comrades, and there is scarcely any doubt that they received these lands as inheritable property, without any other pledge than to help Rollo in the defence of the country."[196] "The Norman constitution at Rollo's death can be described thus, that the duke ruled the country as an independent prince in relation to the Franks; but for its internal government he had a council at his side, whose individual members felt themselves almost as powerful as the duke himself."[197] Sir Francis Palgrave asserts that feudalism was introduced into Normandy by the Duke Richard Sans Peur, the grandson of Rollo, towards the middle of the 10th century. He "enforced a most extensive conversion of allodial lands into feudal tenure," and exacted from his baronage the same feudal submission which he himself had rendered to Hugh Capet.[198]