Donation of Sutri and Papal acquiescence
In 727, Liutprand entered Rome and seized the fortress of Sutri along the Via Cassia near the Lombard border at Tuscany. Alarmed by the Lombards possession of Sutri, Pope Gregory II entreated Liutprand with a "deluge" of money and gifts for a period of some four months before Liutprand assented and gave Sutri over to the Papacy in 728, all the while maintaining control of the nearby district. Historian Jan Hallenbeck surmises that Liutprand occupied Sutri either for the sake of extorting money from the papacy to defer the financial costs of his military campaigns, or it was part of his offensive in central Italy against Byzantine imperial territory. Hallenbeck adds that neither possibility is "mutually exclusive" nor were they especially "certain", but the Lombard king's capture of Sutri did nothing "to disturb the positive relationship between Pavia and Rome" established "earlier in the century". Much fanfare accompanied Liutprand's gift of Sutri—when the king symbolically marched his army to Camp Neronis and laid down his royal insignia, garments, cloak, belt, sword, golden crown and silver cross before Pope Gregory II, which the pontiff ceremoniously handed back in a gesture of acknowledgment to the Lombard monarch's mastery of northern Italy. Shortly thereafter, Liutprand ventured to the Greek monastery of St. Anastosios, a visit which is recorded in a Latin inscription "at the king's foundation at Corteolona.
After handing over Sutri and participating in symbolic motions, Liutprand "effected a surprising diplomatic revolution" by accepting gifts and money from Eutychius, the Exarch of Ravenna, becoming his ally; an event described as a "wicked" arrangement by Gregory II's biographer. This agreement gave the appearance that the Lombard monarch wanted to help Eutychius deal with the independent southern Lombard duchies at Spoleto and Benevento, respectively ruled by the dukes, Thrasimund II and Godescalc. However, Hallenbeck postulates it is more likely that by making an ally of Eutychius, Liutprand was checking the power of the papacy and ensuring the exarch would not make trouble for him on the Adriatic; to this end, Liutprand more or less used Eutychius to restore the Lombard kingdom of Italy.
Following these events, Liutprand and Eutychius led a combined campaign to the gates of Rome but once there, the Lombard king had a change of heart and submitted to Pope Gregory II. He subsequently convinced the pontiff he meant no harm and persuaded both Eutychius and Gregory II to "dwell" in harmony with one another. Hallenbeck explains the ramifications of this development for Liutprand and the papacy alike:...the new Lombard kingdom and the Roman political entity were to coexist in harmony as separate and independent states. But Liutprand evidently went further, trying to indicate that he still supported the papacy against Byzantium. That seems to have been the meaning of the king's successful effort to achieve some form of reconciliation of Exarch Eutychius and Gregory. Liutprand not only refrained from aiding Eutychius against the pope as he had promised but also sponsored the reconciliation, which obviously benefited Gregory in that it eased the deep papal-imperial division and, since it involved no papal submission to the empire, suggested a measure of imperial acquiescence in Rome's separation from Byzantium and emergent autonomy in Rome and the duchy. In sum, far from threatening the papacy, Liutprand was clearly promoting conditions which offered positive benefits and peace with the new Lombard Kingdom of Italy.