Renaissance grows more absurd. Our perspective should rather be that of a long slope of the ascending centuries, rising steadily but slowly from the time of the invasions till the full modern period. Let us look at the details. The break-up of the Roman world which resulted in the first planting of the modern nations, did not cause that vast calamity which we call the Dark Age. The invasion of the Teutons and the infusion of their vigour into the effete society of southern Europe was not a fatal blow to civilisation. Rude as they were when first they crossed the frontiers of the empire, the German peoples, and especially their leaders, gave promise that almost in their own day whatever was of permanent value in the Roman world should be re-incorporated into the new society. This series of recoveries had to be repeated with every new people, but it finally seemed about to culminate in the wider renaissance of Charlemagne. By the year 800 it looked as though Europe were already on the clear path to modern times. But just as the young Teutonic civilisation reached the light, a second wave of invasion came dashing over it. The Vikings, whom Charlemagne’s aged eyes may have watched stealing past the hills of Calais, not only swept the northern seas, but harried Frankland from the Rhine to the Rhone, until progress was at a standstill and the only thought of the ninth century was that of defence. Then the Hungarians came raiding up the Danube valley, and the Slavs pressed in upon the North. Along the coasts of the Mediterranean the Moorish corsairs were stifling the weak commerce of Italian towns, and landing they attacked such ports as Pisa and even sacked a part of Rome. The nascent civilisation of the Teutons was forced to meet a danger such as would call for all the legions of Augustus. No wonder the weak Caroline kings sank under the burden and the war lords of the different tribes grew stronger as the nerveless state fell defenceless before the second great migration, or maintained but partial safety in the natural strongholds of the land. In such a situation self-defence became a system. The palisade upon some central hill, the hedge and thicket in the plain, or the ditch in the morass, became the shelter and the centre of life for every neighbourhood that stood in the track of the new barbarians. The owner of the fastness led his neighbours and his tenants to battle; they gave him their labour for his protection, the palisades grew into stone walls and the “little camps” (_castella_) became the feudal castles. Those grim, battlemented towers, that rise up before us out of the dark age, were the signs of hope for the centuries that followed. Society was saved, but it was transformed. The protection of a time of danger became oppression in a time of safety, and the feudal tyranny fastened upon Europe with a strength that cities and kings could only moderate but not destroy.