(h silent), in Shakespeare's King John, is Hubert de Burgh, Justice of England, created Earl of Kent. He died 1243.
Hubert was so fond of the chase that he neglected his religious duties for his favourite amusement, till one day a stag bearing a crucifix menaced him with eternal perdition unless he reformed. Upon this the merry huntsman entered a cloister, became in time Bishop of Lièe, and the apostle of Ardennes and Brabant. Those who were descended of his race were supposed to possess the power of curing the bite of mad dogs.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894