Frederick, exceedingly irritated, replied to the accusations of Gregory with much bitterness. In his apology, which he sent to all the princes of Christendom, he complained strongly of the usurpations of the Holy See, and exposed, in the most odious colours, the policy and ambitious designs of the court of Rome. “The Church of Rome,” said he, “sends legates everywhere, _with power to punish, to suspend, and excommunicate, not with the designs of spreading the word of God, but to heap up money, and reap that which they have not sown_.” The emperor reminded the princes, in his letters, of the violences which the pope had exercised against the count of Thoulouse and the king of England; he said that the domains of the clergy did not now satisfy the ambition of the Holy See, and that the sovereign pontiffs wished to lay their hands upon every kingdom. From that moment open war was declared between the pope and the emperor; neither of them possessed a pacific character or a love of quiet; both were animated by boundless ambition, jealous to excess of their power, implacable in their revenge, and always ready to employ the arms which the Church or fortune placed in their hands. Gregory displayed an indefatigable activity, leaving his enemies no repose, but pursuing them at the same time with the thunders of religion and war. In addition to the arms of eloquence, the pontiff did not disdain to employ satire; the manifestoes which he published against his adversaries constantly recalled the spirit of the denunciations made by the prophets. These denunciations, mixed with obscure allegories, gave to his words a dark and mysterious tone, which caused him to be considered as the interpreter of angry Heaven. Frederick was neither a less able prince nor a less redoubtable enemy: the art of war contained no stratagems or secrets with which he was unacquainted; policy dictated no means that he scrupled to employ. Endowed with all the gifts of mind, and with a keen spirit of raillery, he was as competent to confound his enemies in a discussion, as to conquer them in the field of battle. Descended, on the female side, from those famous Normans who had conquered Sicily and the kingdom of Naples, he united, as they had done, courage with subtlety, and audacity with dissimulation: to please the court of Rome, he had made barbarous laws against heretics; and, now become the enemy of the popes, he did not fear to arm heretics or Saracens against the court of Rome. When the kingdom of Jerusalem was offered to him, he set no great value upon the acquisition; but he accepted it with joy, in order to increase his popularity in the Christian world, and to arm himself, one day, against the sovereign pontiff with a title, which was then held in universal veneration.