Despite the very limited information provided by the written sources, it is clear that the people who were raiding Britain at the turn of the eighth century came from somewhere in the ‘Danish’-speaking (that is, Old Norse-speaking) north-east and – most importantly from the perspective of Christian writers – were heathens. In the year 800, the Baltic was a pagan lake. The people who had turned their attention to Britain came from the west of this region – from what is now Denmark, Norway and Sweden – but all of the neighbouring lands to the east were also inhabited by pagan peoples, by Baltic and Slavic tribes in (moving clockwise around the Baltic coast) modern Finland, Russia, Estonia, Latvia, Lithuania, Russia (again), Poland and Germany. It would be wrong to draw very firm distinctions or borders between these groups – as in Britain, it is better to try to forget everything we know about the way that the storms of history have left their tide lines on the map. The formation of modern north-eastern Europe – its political geography and its religious and ethno-linguistic fault-lines – has been the result of more than a millennium of often catastrophic upheaval that lasted well into the second half of the twentieth century. The people who formed Viking raiding parties could have been (and in later centuries demonstrably were) drawn from all over this wider region.2
To the south and west was the Carolingian Empire, a great swathe of Europe – corresponding to most of modern France, northern Italy, western Germany and the Low Countries – united under a Frankish king (the Franks were a Germanic tribe who had begun to settle the Roman province of Gaul in the fifth century and who give their name to the modern nation of France). That king, in the same year, had been crowned emperor of the Romans by Pope Leo III, a title that confirmed him as the sanctioned champion of an aggressive Christianity and the successor to the authority of the long-defunct Roman Empire in the west (the eastern, or Byzantine, Empire, centred on Constantinople – modern Istanbul – remained a going concern). That king would come to be known as ‘Karolus Magnus’: ‘Charles the Great’, or Charlemagne. By the time he received the imperial crown, Charlemagne had already redrawn the boundaries of Christendom in western Europe. In particular, a series of bloody campaigns against the pagan Saxons of northern Germany – effectively completed in 797, though revolts continued until 804 – had brought the boundaries of Frankish Christian Europe into contact with the pagan Scandinavian and Slavic tribes of the Jutland peninsula and western Baltic littoral. These wars had been exceptional for their combination of extreme brutality with religious zeal. In 772 Charlemagne ordered the destruction of the Irminsul, a holy tree or pillar central to Saxon worship.
Ten years later, in a particularly notorious incident, he had 4,500 Saxon prisoners beheaded on the banks of the River Weser near the town of Verden, apparently in retribution for their involvement in a revolt against Frankish domination. This was followed by laws that made death the penalty for refusing baptism.3 The violence of Charlemagne’s Christian mission prefigured the Crusades by three centuries.
Whatever the precise nature of the religious beliefs of the Saxons, it is likely – as we shall see – that they were shared, at least in part or in outline, by their neighbours to the north in what is now Denmark. Indeed, an inconsistent but interconnected network of beliefs, stories and rituals extended from the borders of the Frankish world throughout the Baltic world, linking together people of markedly different linguistic and cultural backgrounds through broadly compatible world-views and systems of social hierarchy. It is certain that Charlemagne’s bellicose Christian foreign policy would have sent ripples of alarm shuddering out across the Baltic. Kings, chieftains, priests and priestesses would have wondered how long it would be before their traditional way of life and their political independence would be snuffed out beneath the hooves of Frankish horsemen, how soon they would see their timber halls burning and their sacred groves falling beneath the axes of Christian missionaries.4
This fear and uncertainty prompted a range of reactions. Some, like the Slavic Obodrites, did a deal with the superpower to their west, accepting Charlemagne as nominal overlord, providing the Empire with military aid and, in return, maintaining a level of political and religious freedom. They did this, admittedly, under duress: Charlemagne had invaded their territory and taken hostages. The Danes, for their part, provided shelter to Charlemagne’s enemies and took steps to defend their landward border with Saxony by reinforcing the ditch and rampart structure – the Danevirke (literally the ‘Dane-work’) – that divided Germania from the Jutland peninsula.5 As Charlemagne’s conquests in Saxony became established geopolitical facts, Danish kings increasingly found themselves having to deal directly with Frankish power.
In 804, the Danish king Godfred arrived with his fleet and ‘the entire cavalry of his kingdom’ at Hedeby (Schleswig) on the Danish border.6 It was a show of strength and, after a diplomatic exchange with the emperor, he departed – feeling, presumably, that he had roared loudly enough to convince his Frankish neighbours that the Danes were not to be trifled with. In 808, however, he apparently changed his mind, this time crossing with his army into Obodrite territory to the south-east, sacking a number of Slav settlements and burning the coastal trading settlement at Reric. The Obodrite inhabitants of the town, on the Baltic coast east of Jutland (close to the modern German town of Wismar), may have been accustomed to paying tribute to the Danish king. If so, the alliance with Charlemagne put an end to that, and also gave the Frankish Empire a friendly port on the Baltic. It was probably for both these reasons that Godfred, after destroying the town, deported its traders to Hedeby, placing them – and their tax revenues – firmly within his own sphere of control.7
Charlemagne hardly leapt to the defence of his allies. The Frankish Royal Annals describe how he sent his son Charles to wait at the banks of the Elbe to make sure that no one entered Saxon territory; the Obodrites were left to their fate. Once the Danish army had withdrawn, the Franko-Saxon army crossed the river and burned the fields of those Slavic tribes who had allied themselves with the Danes (and who had probably done so in order to avoid similar treatment from the Danish king; this has ever been the fate of small tribal communities – the weakest always suffer the most). Some fairly empty diplomacy followed in 809 – conducted, so it would seem, to give both sides an excuse to shore up the loyalty of their various Slavic allies. Godfred, however, had not finished baiting the Empire.
In the summer of 810, Charlemagne was at the great palace complex he had commissioned at Aachen (now in Germany), the new capital of his hard-won realm. The cathedral at Aachen still incorporates a building – the Palatine Chapel – built as part of the original palace in the 790s by the architect Odo of Metz. The extraordinary scale and lavish attention to detail of the building, with its many-coloured marble floors and tiers of rounded portals – the eight sides of the central vestibule surrounded by the sixteen-sided outer perimeter – are the monumental vestiges of the staggering wealth and imperial grandeur of Carolingian power at its apogee. Gleaming white stone, green porphyry and blood-red Egyptian granite, frescos and mosaics, marble and bronze – the remains of great civilizations of the past were being gathered together, literally building a new empire.8
In 787, Pope Hadrian I wrote to Charlemagne agreeing to let him take from Ravenna ‘mosaic and marble and other materials both from the floors and the walls’, and the emperor’s biographer – Einhard – describes him having marbles and sculptures brought from Rome and Ravenna to adorn the palace at Aachen.9 The most startling of all the surviving fixtures of the Palatine Chapel, however, is the throne. Raised on a dais of six steps, the simple and unadorned seat exudes a living presence from the vaulted shadows. Though it has been sat upon by thirty-one German kings since Charlemagne’s day, it