“Another instance of this revengeful spirit occurred in the year 1271 at Viterbo, where the cardinals had assembled to elect a successor to Clement the Fourth, about whom they had been long disputing: Charles of Anjou and Philip of France, with Edward and Henry, sons of Richard, Duke of Cornwall, had repaired there, the two first to hasten the election, which they finally accomplished by the elevation of Gregory the Tenth. During these proceedings Prince Henry, while taking the sacrament in the church of San Silvestro at Viterbo, was stabbed to the heart by his own cousin, Guy de Montfort, in revenge for the Earl of Leicester’s death, although Henry was then endeavoring to procure his pardon. This sacrilegious act threw Viterbo into confusion, but Montfort had many supporters, one of whom asked him what he had done. ‘