Europe towards the middle of the ninth century was still simmering in a state of semi-chaos, out of which were shortly to be evolved many of the national organisms which have lasted to modern times. Charles the Great, by the supreme folly of dividing amongst his three sons the empire he had so carefully built up, had to a great degree undone the work of his life, and political barriers are rather difficult to trace after the partition of Verdun (843), though in the dominions assigned to Charles II. some semblance of the later kingdom of France may be traced. Germany was in a transition state; the strong hand which had established dependent and responsible dukes and counts in the various Teutonic provinces--Saxony, Franconia, Swabia, Bavaria, and Karinthia--had been withdrawn, and as yet these princes had not erected their fiefs into independent hereditary duchies. Scarcely tamed and civilised themselves, the frontier districts of the east were bordered continuously by Danes, Wends, Czechs, Avars, and Slavonians, ever ready to make hostile incursions upon their territory. Hamburg in those days stood as a frontier town, almost an outpost in an enemy’s country, and formed with Paderborn and Bremen the high-water mark of the Frankish expansion on the north-eastern marches. In England national unification was in a more advanced stage; Wessex had gradually absorbed the other constituents of the so-called Heptarchy, with the exception of Mercia, which still held out a nominally separate existence. London, at this period a wooden-built town surrounded by a wall of stone, was beginning to be commercially important. In Spain the Christians had established among the mountains of Asturias the little kingdom of Leon, and were commencing the long struggle which was eventually to drive the Moors out of the peninsula. South of Rome and the Imperial territories in Italy, the duchy of Benevento alone foreshadowed the crowd of principalities and commonwealths which were to spring into existence in that country. To the east the Byzantine Empire, pressed by the Saracens in its Asiatic possessions, by Bulgars and Slavs on its northern boundary, severed from Rome, Ravenna, and the Western world by divergencies of ritual and dogma, humiliated by military reverses in various quarters, still loomed splendid and imposing in her isolation, and the dreaded Greek fire, if no longer “the Fire of old Rome,” helped to make her navies respected in the Mediterranean and Black Sea.