The emperors themselves were the only sincere and consistent champions of centralized monarchical power, but the emperors were probably less patriotic than any one else in the Holy Roman Empire. Charles V would never abandon his pretensions to world power in order to become a strong monarch over a single nation. Early in his reign he declared that "no monarchy was comparable though not to the Roman Empire. This the whole world had once obeyed, and Christ Himself had paid it honor and obedience. Unfortunately it was now only a shadow of what it had been, but he hoped, with the help of those powerful countries and alliances which God had granted him, to raise it to its ancient glory." Charles V labored for an increase of personal power not only in Germany but also in the Netherlands, in Spain, and in Italy; and with the vast imperial ambition of Charles the ideal of creating a national monarchy on a strictly German basis was in sharp conflict. Charles V could not, certainly would not, pose simply as a German king--a national leader. [Sidenote: Nationalism among the German Princes] Under these circumstances the powerful German princes, in defying the emperor's authority and in promoting disruptive tendencies in the Holy Roman Empire, were enabled to lay the blame at the feet of their unpatriotic sovereign and thereby arouse in their behalf a good deal of German national sentiment. In choosing Charles V to be their emperor, the princely electors in 1519 had demanded that German or Latin should be the official language of the Holy Roman Empire, that imperial offices should be open only to Germans, that the various princes should not be subject to any foreign political jurisdiction, that no foreign troops should serve in imperial wars without the approval of the Diet, and that Charles should confirm the sovereign rights of all the princes and appoint from their number a Council of Regency (_Reichsregiment_) to share in his government. [Sidenote: The Council of Regency, 1521-1531] [Sidenote: Its Failure to Unify Germany]