Readers with very retentive memories may recall how, at the end of his struggle with Simon de Montfort, Edward and his friends had compelled Robert de Ferrers, earl of Derby, to surrender his estates to Edmund of Lancaster. John de Ferrers, as the son of the dispossessed and long-deceased victim, had lately begun a campaign to recover his lost inheritance, and Winchelsea had decided to act as his champion. In 1301, having secured permission from the pope, the archbishop had actually begun to judge the case in his own court, and had summoned the new earl of Lancaster to answer Ferrers' accusation of unlawful disseisin. Needless to say, the king, already deeply embittered, must have been enraged by Winchelsea's efforts to revisit this discreditable episode from his distant past. The archbishop had soon found himself being countersued in the king's courts, charged with trying to disinherit the Crown and subvert the realm.
In 1305 the gloves really came off. During the spring, as Bigod was being pardoned his debts, Winchelsea was hit with a demand for £4,000 of unpaid taxes.