Historians ascribe their first rupture to the king's refusal of making restitution of the Hereford estate; but it is certain from records, that he passed a grant for that purpose, and that the full demands of Buckingham were satisfied in this particular.

Perhaps Richard was soon sensible of the danger which might ensue from conferring such an immense property on a man of so turbulent a disposition, and afterwards raised difficulties about the execution of his own grant: perhaps he refused some other demands of Buckingham, whom he found it impossible to gratify for his past services: perhaps he resolved, according to the usual maxim of politicians, to seize the first opportunity of ruining this powerful subject, who had been the principal instrument of his own elevation; and the discovery of this intention begat the first discontent in the duke of Buckingham.

However this may be, it is certain that the duke, soon after Richard's accession, began to form a conspiracy against the government, and attempted to overthrow that usurpation which he himself had so zealously contributed to establish.
Never was there in any country a usurpation more flagrant than that of Richard, or more repugnant to every principle of justice and public interest.

His claim was entirely founded on impudent allegations, never attempted to be proved; some of them incapable of proof, and all of their implying scandalous reflections on his own family, and on the persons with whom he was the most nearly connected.

His title was never acknowledged by any national assembly, scarcely even by the lowest populace to whom he appealed; and it had become prevalent merely for want of some person of distinction, who might stand forth against him, and give a voice to those sentiments of general detestation which arose in every bosom.