Hugh Bigod, one of the firmest adherents of the two Earls, was chosen as Justiciar.

The claim to elect this great officer was in fact the leading point in the baronial policy.

But further measures were needed to hold in check such arbitrary misgovernment as had prevailed during the last twenty years.

By the "Provisions of Oxford" it was agreed that the Great Council should assemble thrice in the year, whether summoned by the king or no; and on each occasion "the Commonalty shall elect twelve honest men who shall come to the Parliaments, and at other times when occasion shall be when the King and his Council shall send for them, to treat of the wants of the king and of his kingdom.

And the Commonalty shall hold as established that which these Twelve shall do." Three permanent committees of barons and prelates were named to carry out the work of reform and administration.