But though much of the success of the Utraquist wars was due to the energy of Z̆iz̆ka and his followers, the leading citizens of Prague had also a very important influence on the struggle; and Sigismund’s actions soon roused in them that desperate courage which had seemed for a moment to forsake them. The nickname of Sigismund, “Super Grammaticam,” has been fixed on this Emperor by Carlyle; but an even more distinctive name would have been Sigismund “Super Veritatem.” Many other rulers have told lies in their time of emergency; but surely no one ever took so much pains to write himself down a liar as Sigismund did at every stage of his career. It will be remembered that he had written most urgently to the Bohemians, to express his regret for the death of Hus, and to assure them that he had done all he could to prevent it. Yet, as soon as Pope Martin had published his Bull, urging a crusade against the Hussites, Sigismund seized upon a merchant of Prague named Krasa, and publicly burnt him in Breslau, on the express ground that he had disapproved of the burning of Hus and Jerom. C̆enek of Wartenberg, who had been entrusted by Sigismund with the care of the fortress of Prague, now declared that he could no longer serve the king. At nearly every stage in the career of this unfortunate nobleman, his change of opinion, however excusable in itself, was stained by some act of treachery. On this occasion he invited the subordinate governors of the castle to dinner, and seized that opportunity for arresting and imprisoning them. Having thus mastered the castle, he placed it under the care of the citizens of Prague. He then arrested seventy-six of the clergy, and drove several of the opposing citizens from the town.