No sooner had Pippin recrossed the Alps than the Lombard king, ever anxious to add Rome to his possessions, again invested the Eternal City. Pope Stephen's letters to the king of the Franks at this juncture are characteristic of the time. The pope warmly argues that Pippin owes all his victories to St. Peter and should now hasten to the relief of his successor. If the king permits the city of the prince of the apostles to be lacerated and tormented by the Lombards, his own soul will be lacerated and tormented in hell by the devil and his pestilential angels. These arguments proved effective; Pippin immediately undertook a second expedition to Italy, from which he did not return until the kingdom of the Lombards had become tributary to his own, as Bavaria and Aquitaine already were. [Sidenote: Donation of Pippin.] Pippin, instead of restoring to the eastern emperor the lands which the Lombards had recently occupied, handed them over to the pope,--on exactly what terms we do not know, since the deed of cession has disappeared. In consequence of these important additions to the former territories of St. Peter, the popes were thereafter the nominal rulers of a large district in central Italy, extending across the peninsula from Ravenna to a point well south of Rome. If, as many writers have maintained, Pippin recognized the pope as the sovereign of this district, we find here the first state that was destined to endure into the nineteenth century delimited on the map of Europe. A map of Italy as late as the year 1860 shows the same region still marked "States of the Church." [Sidenote: Significance of Pippin's reign.] The reign of Pippin is remarkable in several ways. It witnessed the strengthening of the kingly power in the Frankish state, which was soon to embrace most of western Europe and form the starting point for the development of the modern countries of France, Germany, and Austria. It furnishes the first instance of the interference of a northern prince in the affairs of Italy, which was destined to become the stumbling-block of many a later French and German king. Lastly, the pope had now a state of his own, which, in spite of its small size, proved one of the most important and permanent in Europe. Pippin and his son Charlemagne saw only the strength and not the disadvantage that accrued to their title from the papal sanction. It is none the less true, as Gibbon says, that "under the sacerdotal monarchy of St. Peter, the nations began to resume the practice of seeking, on the banks of the Tiber, their kings, their laws, and the oracles of their fate." We shall have ample evidence of this as we proceed. General Reading.--For Mohammed and the Saracens, GILMAN, _The Saracens_ (G.P. Putnam's Sons, $1.50). Gibbon has a famous chapter on Mohammed and another upon the conquests of the Arabs. These are the fiftieth and fifty-first of his great work. See also MUIR, _Life of Mohammed_ (Smith, Elder & Co., $4.50).