237.
{1403.} The obligations which Henry had owed to Northumberland, were of a kind the most likely to produce ingratitude on the one side, and discontent on the other.

The sovereign naturally became jealous of that power which had advanced him to the throne; and the subject was not easily satisfied in the returns which he thought so great a favor had merited.

Though Henry, on his accession, had bestowed the office of constable on Northumberland for life,[*] and conferred other gifts on that family, these favors were regarded as their due; the refusal of any other request was deemed an injury.
* Rymer, vol.viii.p.

89.
The impatient spirit of Harry Piercy, and the factious disposition of the earl of Worcester, younger brother of Northumberland, inflamed the discontents of that nobleman; and the precarious title of Henry tempted him to seek revenge, by overturning that throne which he had at first established.

He entered into a correspondence with Glendour: he gave liberty to the earl of Douglas, and made an alliance with that martial chief: he roused up all his partisans to arms; and such unlimited authority at that time belonged to the great families, that the same men, whom, a few years before, he had conducted against Richard, now followed his standard in opposition to Henry.