That the transition(247) of the lands secured to the Pope into the relation of vassals to a sovereign was a matter of time is explained by the insufficient material force at the command of the Pope, the love of independence in the population, their power to resist, and the general conditions of the time. Thus, from a letter of Adrian to Charles, in 787 or 788, we learn that he announced to the king how he had received the cities of Toscanella. Bagnorea, and Viterbo, and requested from him the tradition of Populania, and Rosella, near Piombino. Later, he shows him that he had not yet received them, though two messengers of Charles had been charged with their delivery. Thus it required fresh efforts on the part of the Franks, and fresh reminders on the part of the Pope, to obtain the complete execution of the gift. This does not show that Charles was unwilling to keep his word: but it does show the difficulty of the matter. It was a great undertaking to pacify the population in a number of cities, and to subject the great and the small proprietors in them to the papal lordship. Adrian had reason sometimes to express the wish to the king that it might be accomplished in their life-time. Sometimes Charles’s own Commissioners were not trustworthy, were disinclined to the Pope, were liable to be corrupted or deceived, or made mistakes in executing their commission. In March, 781, Charles came again to Italy, celebrated Easter on the 15th of April at Rome, treated with the Pope, had his little son, Pipin, four years old, baptised, and made him, after the Pope had anointed him, king of the Lombards. The duchies of Spoleto and Benevento were to be vassal lands of the Pope. The distance of the latter from the Franks, the connection of the Duke Arichis with Desiderius, and the nearness to the Greeks, who occupied Gaicta, and other parts of Campania, caused special difficulties here. This gradual acquisition of the territories promised by Charles in 774 occupied a number of years; but in them Adrian had every reason to praise the good faith of Charles and the Franks.