St. Boniface did not confine himself to the evangelization of the pagans; he labored ardently in the Christian Gallo-Frankish Church to reform the manners and ecclesiastical discipline, and to assure, while justifying, the moral influence of the clergy by example as well as precept. The councils, which had almost fallen into desuetude in Gaul, became once more frequent and active there: from 742 to 753 there may be counted seven, presided over by St. Boniface, which exercised within the Church a salutary action. King Pépin, recognizing the services which the archbishop of Mayence had rendered him, seconded his reformatory efforts at one time by giving the support of his royal authority to the canons of the councils, held often simultaneously with and almost confounded with the laic assemblies of the Franks; at another by doing justice to the protests of the churches against the violence and spoliation to which they were subjected.
"There was an important point," says M. Fauriel, "in respect of which the position of Charles Martel's sons turned out to be pretty nearly the same as that of their father: it was touching the necessity of assigning warriors a portion of the ecclesiastical revenues. But they, being more religious, perhaps, than Charles Martel, or more impressed with the importance of humoring the priestly power, were more vexed and more anxious about the necessity under which they found themselves of continuing to despoil the churches and of persisting in a system which was putting the finishing stroke to the ruin of all ecclesiastical discipline. They were more eager to mitigate the evil and to offer the Church compensation for their share in this evil to which it was not in their power to put a stop. Accordingly, at the March parade, held at Leptines in 743, it was decided, in reference to ecclesiastical lands applied to the military service: 1st, that the churches having the ownership of those lands should share the revenue with the lay holder; 2d, that on the death of a warrior in enjoyment of an ecclesiastical benefice, the benefice should revert to the Church; 3d, that every benefice, by deprivation whereof any church would be reduced to poverty, should be at once restored to her.
"That this capitular was carried out, or even capable of being carried out, is very doubtful; but the less Carloman and Pépin succeeded in repairing the material losses incurred by the Church since the accession of the Carlovingians, the more zealous they were in promoting the growth of her moral power and the restoration of her discipline ... That was the time at which there began to be seen the spectacle of the national assemblies of the Franks, the gatherings at the March parades transformed into ecclesiastical synods under the presidency of the titular legate of the Roman pontiff, and dictating, by the mouth of the political authority, regulations and laws with the direct and formal aim of restoring divine worship and ecclesiastical discipline, and of assuring the spiritual welfare of the people."
Pépin, after he had been proclaimed king and had settled matters with the Church as well as the warlike questions remaining for him to solve permitted, directed all his efforts toward the two countries which, after his father's example, he longed to reunite to the Gallo-Frankish monarchy, that is, Septimania, still occupied by the Arabs, and Aquitaine, the independence of which was stoutly and ably defended by Duke Eudes' grandson, Duke Waifre. The conquest of Septimania was rather tedious than difficult. The Franks, after having victoriously scoured the open country of the district, kept invested during three years its capital, Narbonne, where the Arabs of Spain, much weakened by their dissensions, vainly tried to throw in reinforcements. Besides the Mussulman Arabs, the population of the town numbered many Christian Goths, who were tired of suffering for the defence of their oppressors, and who entered into secret negotiations with the chiefs of Pépin's army, the end of which was that they opened the gates of the town. In 759, then, after forty years of Arab rule, Narbonne passed definitively under that of the Franks, who guaranteed to the inhabitants free enjoyment of their Gothic or Roman law and of their local institutions. It even appears that, in the province of Spain bordering on Septimania, an Arab chief, called Soliman, who was in command at Gerona and Barcelona, between the Ebro and the Pyrenees, submitted to Pépin, himself and the country under him. This was an important event, indeed, in the reign of Pépin, for here was the point at which Islamism, but lately aggressive and victorious in Southern Europe, began to feel definitively beaten and to recoil before Christianity.
The conquest of Aquitaine and Vasconia was much more keenly disputed and for a much longer time uncertain. Duke Waif re was as able in negotiation as in war; at one time he seemed to accept the pacific overtures of Pépin, or, perhaps, himself made similar, without bringing about any result; at another, he went to seek and found even in Germany allies who caused Pépin much embarrassment and peril. The population of Aquitaine hated the Franks; and the war, which for their duke was a question of independent sovereignty, was for themselves a question of passionate national feeling.
Pépin, who was naturally more humane and even more generous, it may be said, in war than his predecessors had usually been, was nevertheless induced, in his struggle against the Duke of Aquitaine, to ravage without mercy the countries he scoured, and to treat the vanquished with great harshness. It was only after nine years' war and seven campaigns full of vicissitudes that he succeeded, not in conquering his enemy in a decisive battle, but in gaining over some servants who betrayed their master. In the month of July, 759, "Duke Waifre was slain by his own folk, by the King's advice," says Frédégaire; and the conquest of all Southern Gaul carried the extent and power of the Gallo-Frankish monarchy farther and higher than it had ever yet been, even under Clovis.
In 753 Pépin had made an expedition against the Britons of Armorica, had taken Vannes and "subjugated," add certain chroniclers, "the whole of Brittany." In point of fact, Brittany was no more subjugated by Pépin than by his predecessors; all that can be said is that the Franks resumed under him an aggressive attitude toward the Britons, as if to vindicate a right of sovereignty.
Exactly at this epoch Pépin was engaging in a matter which did not allow him to scatter his forces hither and thither. It has been stated already, that in 741 Pope Gregory III had asked aid of the Franks against the Lombards who were threatening Rome, and that, while fully entertaining the Pope's wishes, Charles Martel had been in no hurry to interfere by deed in the quarrel. Twelve years later, in 753, Pope Stephen, in his turn threatened by Astolphus, King of the Lombards, after vain attempts to obtain guarantees of peace, repaired to Paris, and renewed to Pépin the entreaties used by Zachary. It was difficult for Pépin to turn a deaf ear; it was Zachary who had declared that he ought to be made king; Stephen showed readiness to anoint him a second time, himself and his sons; and it was the eldest of these sons, Charles, scarcely twelve years old, whom Pépin, on learning the near arrival of the Pope, had sent to meet him and give brilliancy to his reception.
Stephen passed the winter at St. Denis, and gained the favor of the people as well as that of the King. Astolphus peremptorily refused to listen to the remonstrances of Pépin, who called upon him to evacuate the towns in the exarchate of Ravenna, and to leave the Pope unmolested in the environs of Rome as well as in Rome itself. At the March parade held at Braine, in the spring of 754, the Franks approved of the war against the Lombards; and at the end of the summer Pépin and his army descended into Italy by Mount Cenis, the Lombards trying in vain to stop them as they debouched into the valley of Suza. Astolphus, beaten, and, before long, shut up in Pavia, promised all that was demanded of him; and Pépin and his warriors, laden with booty, returned to France, leaving at Rome the Pope, who conjured them to remain awhile in Italy, for to a certainty, he said, King Astolphus would not keep his promises. The pope was right. So soon as the Franks had gone, the King of the Lombards continued occupying the places in the exarchate and molesting the neighborhood of Rome.
The Pope, in despair and doubtful of his auxiliaries' return, conceived the idea of sending "to the King, the chiefs, and the people of the Franks, a letter written, he said, by Peter, apostle of Jesus Christ, Son of the living God, to announce to them that, if they came in haste, he would aid them as if he were alive according to the flesh among them, that they would conquer all their enemies and make themselves sure of eternal life!" The plan was perfectly successful: the Franks once more crossed the Alps with enthusiasm, once more succeeded in beating the Lombards, and once more shut up in Pavia King Astolphus, who was eager to purchase peace at any price. He obtained it on two principal conditions: (1) That he would not again make a hostile attack on Roman territory, or wage war against the Pope or people of Rome; (2) that he would henceforth recognize the sovereignty of the Franks, pay them tribute, and cede forthwith to Pépin the towns and all the lands belonging to the jurisdiction of the Roman Empire, which were at that time occupied by the Lombards. By virtue of these conditions Ravenna, Rimini, Pesaro, that is to say, the Romagna, the duchy of Urbino, and a portion of the Marches of Ancona, were at once given up to Pépin, who, regarding them as his own direct conquest, the fruit of victory, disposed of them forthwith in favor of the popes, by that famous deed of gift which comprehended pretty nearly what has since formed the Roman States, and which founded the temporal independence of the papacy, the guarantee of its independence in the exercise of the spiritual power.