[Sidenote: The conflict concerning investitures.] From these movements of the papacy sprang the conflict with the Emperors of Germany respecting investitures. The Bishop of Milan--who, it appears, had perjured himself in the quarrel respecting concubinage--had been excommunicated by Alexander II. The imperial council appointed as his successor one Godfrey; the pope had nominated Atto. Hereupon Alexander had summoned the emperor to appear before him on a charge of simony, and granting investitures without his approbation. While the matter was yet in abeyance, Alexander died; but Gregory took up the contest. A synod he had assembled ordered that, if any one should accept investiture from a layman, both the giver and receiver should be excommunicated. The pretence against lay-investiture was that it was a usurpation of a papal right, and that it led to the appointment of evil and ignorant men; the reality was a determination to extend papal power, by making Rome the fountain of emolument. Gregory, by his movements, had thus brought upon himself three antagonists--the imperial power, the Italian nobles, and the married clergy. The latter, unscrupulous and exasperated, met him with his own weapons, not hesitating to calumniate his friendship with the Countess Matilda. It was also suspected that they were connected with the outrage perpetrated by the nobles that took place in Rome. [Sidenote: Outrage on Hildebrand.] On Christmas night, A.D. 1075, in the midst of a violent rain, while the pope was administering the communion, a band of soldiers burst into the church, seized Gregory at the altar, stripped and wounded him, and, haling him on horseback behind one of the soldiers, carried him off to a stronghold, from which he was rescued by the populace. But, without wavering for a moment, the undaunted pontiff pressed on his conflict with the imperial power, summoning Henry to Rome to account for his delinquencies, and threatening his excommunication if he should not appear before an appointed day. In haste, under the auspices of the king, a synod was assembled at Worms; charges against the pope of licentious life, bribery, necromancy, simony, murder, atheism, were introduced and sentence of deposition pronounced against him. On his side, Gregory assembled the third Lateran Council, A.D. 1076, placed King Henry under interdict, absolved his subjects from allegiance, and deposed him. [Sidenote: He defines the position of the Church,] A series of constitutions, clearly defining the new bases of the papal system, was published. They were to the following effect: "That the Roman pontiff can alone be called universal; that he alone has a right to depose bishops; that his legates have a right to preside over all bishops in a general council; that he can depose absent prelates; that he alone has a right to use imperial ornaments; that princes are bound to kiss his feet, and his only; that he has a right to depose