The importance of Flambard in Rufus's reign has always been acknowledged. All the chroniclers, in more or less strident language, put him in the forefront of those responsible for Rufus's exactions and lay the blame chiefly on him for the misfortunes they relate. Stubbs in working out his idea of constitutional development gave Flambard a more determined position in this scheme than he had ever held before. It will first be useful to see what kind of picture of Flambard he and, later, Freeman evolved. The chief difficulty Stubbs had in Rufus's reign was to find some guiding hand for the “hardening and sharpening” of feudalism which in his view was going on at that time, and for the introduction of new feudal practices. He required some single and unscrupulous innovator to account for a process which he thought time alone would not have brought about. Stubbs, looking from the point of view of constitutional development, explained the evolution of the conditions described in Henry I's coronation charter as the work of Flambard. The charter showed, for instance, heirs to feudal fiefs having to buy back their lands on the death of the holder instead of merely paying a relief—a stringency which he explained by the discovery of a legal mind working out feudal principle.