Thomas Mowbray, Duke of Norfolk is infamous for murdering (or being responsible for the murder of) theDuke of Gloucester, who was a prisoner at Calais at the time when Mowbray was Captain of Calais. Mowbray is featured in Shakespeare's Richard II, in which he is accused of murdering Gloucester by Bolingbrooke, Duke of Hereford. Richard II quickly banishes Mowbray as he does not want the secret that he was involved to be revealed as well.