Gregory VII had an astute grasp of political realities and was always willing to take them into account, provided they fit in with his own reform efforts. Papal territorial claims intensified markedly. He was the first pope to try to contact every ruler of his time, asserting the overlordship of the apostle Peter—that is, of the papacy—in several regions of Europe. The most successful example of the use of feudal arrangements by the papacy—Norman greed notwithstanding—was the alliance with the Norman leaders of southern Italy, concluded with Richard of Capua in 1073 and Robert Guiscard in 1059. Their obligations included fealty to the pope and his legitimate successors as well as military and financial aid. In return, the pope became their overlord and invested them with the imperial and Byzantine-Muslim territories that they had conquered or would conquer. In Spain, Croatia-Dalmatia, Denmark, Hungary, the kingdom of Kiev, Brittany, Poland, and Bohemia, as well as in England, Gregory tried to assert overlordship, mostly unsuccessfully. William I of England, whose invasion of 1066 Hildebrand had supported, refused outright the oath Gregory requested, although he resumed the Anglo-Saxon payment of Peter’s Pence (annual contribution to the pope). Except in southern Italy, areas of northern Spain, and the islands of Sicily, Corsica, and Sardinia, Gregory’s attempts to expand the role of the papacy met with little success.

Direct papal intervention in the appointment of bishops created severe tensions in France and even more so in Germany, which, with Burgundy and much of Italy, constituted what would later be called the Holy Roman Empire (see Researcher’s Note). As early as December 1073, Gregory called King Philip I of France (reigned 1059/60–1108) the worst of all princely tyrants oppressing the church because the king refused to invest a canonically elected bishop with the secular properties and rights of the bishopric. This controversy was inspired by Gregory’s vision of proper canonical elections, which meant election by the clergy and populace of a diocese without any interference from secular rulers of any rank. Election was then a flexible term and should not be confused with the modern concept of democratic election. It was accepted as self-evident that the Holy Spirit should speak through the most influential members of a community, be it a diocese or abbey. This was a strong contrast to traditions that had prevailed for many centuries. Royal nominations to bishoprics and abbeys agreed to by representatives of the respective diocese had constituted an important part of royal authority at the time, and Gregory’s insistence on the elimination of secular influence threatened the very existence of the kingdoms. This, at least, was the conviction of Emperor Henry IV. Philip of France also turned a deaf ear to papal commands, even when the pope threatened excommunication and interdict in December 1073 and a year later announced that he would do everything in his power to depose Philip. But the French bishops refused to make common cause with Gregory, and Philip’s reign continued. His quarrels with the pope were smoothed over, and both parties were able to compromise without loss of face.

This was not the case with regard to Henry IV and the empire, even though there were no signs of the coming conflict at the outset of Gregory’s pontificate. Gregory recognized that Henry IV would soon be emperor and always thought very highly of Henry’s parents, Henry III and Agnes. The pope suggested in a letter of December 1074 that Henry protect Rome and the Roman church during a papal expedition to the Holy Land that he wished to lead in the company of Empress Agnes and Countess Matilda of Tuscany. He relied on Henry’s cooperation as well when he tried to bend the German bishops to his wishes and asked the king to order them to appear at his Roman synods. By December 1075, however, Gregory’s attitude had changed. By letter and messenger (who may have threatened excommunication orally), the pope harshly blamed Henry IV for not negotiating in good faith and for having made royal appointments to the Italian bishoprics of Milan, Fermo, and Spoleto in accordance with old customs, which Gregory abhorred and ordered abolished. He also reproached Henry for continued contact with five of his advisers who had been excommunicated earlier by the pope. Contact with excommunicated persons automatically entailed excommunication for the offender.

On January 24, 1076, at the imperial assembly of Worms, Henry IV and the vast majority of the German bishops replied in even harsher terms to Gregory’s letter and oral message. The bishops renounced their obedience to “Frater Hildebrand,” and the king called on Gregory to abdicate and on the Romans to elect a new pope. Northern Italian bishops immediately joined the action and renounced their support for Gregory. The letters reached Gregory during the customary Lenten synod (February 14–20, 1076), and the outraged pope reacted immediately, using a prayer to Peter to depose and excommunicate Henry. In the same prayer, Gregory also absolved all of Henry’s subjects of their oath of fealty to the king. The effect of the excommunication was tremendous. Never before had a pope deposed a king, even though Gregory, according to a later letter, believed that he had historical precedents on his side, an assumption that even contemporaries considered untenable and a distortion of historical truth. Then as now, the deposition of Henry IV was the most hotly debated action taken by Gregory VII, who pursued to its logical conclusion his conviction that papal primacy pertained not only to the spiritual sphere but to the secular sphere as well. Church reform now became a contest for dominance between the priestly and the royal powers as they struggled to replace the Carolingian vision of mutual collaboration in which the church was entrusted to the monarchy for safekeeping.

In Germany Gregory’s action strengthened princely as well as episcopal opposition to Henry in a civil war that raged intermittently throughout his reign. In order to save his crown, Henry IV submitted to the pope at the castle of Canossa on January 28, 1077. Countess Matilda of Tuscany and Abbot Hugh of Cluny, Henry’s godfather, had interceded for him. Gregory acted as a pastor of souls when he reconciled the king with the church, but Henry’s footfall nonetheless was an implicit recognition of papal claims. The encounter at Canossa had interrupted Gregory’s journey to Augsburg (now in Germany), where he was to meet German princes who had planned to elect a new ruler in opposition to Henry IV. Despite Gregory’s absolution of Henry and return to Rome, the princes proceeded with their plan. Their nominee, Rudolf of Rheinfelden, was elected (anti-)king on March 15, 1077.

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The quarrel between Henry and Gregory intensified after the pope formally prohibited lay investiture at the council of November 1078. Investiture was the customary ceremony in which the emperor or king bestowed upon the bishops the ring and staff, the symbols of their office as well as of royal authority in and protection of the church. Nevertheless, Gregory at first tried to arbitrate between Henry and Rudolf, but he excommunicated Henry for a second time at the Lenten synod of 1080 and formally recognized Rudolf as king. However, after the absolution of Canossa, Henry had reasserted himself. The new excommunication had little effect, and the king was victorious in the civil war. Following the formal deposition of Gregory VII under the aegis of Henry IV by the synod of Brixen in June 1080 and the nomination of Archbishop Wibert of Ravenna as pope, Henry marched on Rome, supported by German and, especially, Italian troops. The Eternal City was finally captured in March 1084, when the Romans, including many cardinals and other clergy, opened the gates to Henry and his army. They had deserted the papal cause in response to Gregory’s inflexibility. Wibert was enthroned as antipope Clement III, and Henry IV was crowned emperor. Gregory VII had at first sought refuge in the Castel Sant’Angelo but in July fled with his Norman liberators to Salerno, where he died on May 25, 1085. According to tradition, his last words were a paraphrase of a passage from Psalm 44, “I have loved righteousness and hated iniquity, therefore I die in exile.”