My noble father, Henry of Buckingham, Who first rais’d head against usurping Richard, Flying for succour to his servant Banister, Being distress’d, was by that wretch betray’d, And without trial fell; God’s peace be with him!
There are no more uses of "usurp" in the play.
Show samples from other sources
Henry IV usurped the throne from Richard II while the latter was fighting in Ireland.
I believe there are more instances of the abridgement of the freedom of the people by gradual and silent encroachments of those in power than by violent and sudden usurpations.