What Caused the Viking Age?

Viking Blog
Lindisfarne Stone, the Viking raid at Lindisfarne

On June 8, 793 A.D., the world of Christendom changed forever. A fleet of mysterious ships appeared off the coast of Northumbria and took aim at the island monastery of Lindisfarne. The Anglo-Saxon Chronicle records:  “In this year terrible portents appeared over Northumbria, and miserably frightened the inhabitants: these were exceptional flashes of lightning, and fiery dragons were seen flying in the air. A great famine soon followed these signs; a little after that in the same year on 8 [June] the harrying of the heathen miserably destroyed God’s church in Lindisfarne by rapine and slaughter.”

In The Two Lives of Charlemagne, by Notker the Stammerer, the emperor of the Carolingian Empire allegedly bore witness to an early raid attempt off the coast of France. So the chronicler tells us when the Northman ships learned Charlemagne and his army had made camp near their target, they turned back and fled. They may not have inflicted any harm to the coast of France on that day, but their sudden appearance and disappearance deeply unnerved the most powerful man in Western Europe of the day. Notker further wrote:

“Charlemagne, who was a God-fearing, just and devout ruler, rose from the table and stood at the window facing East. For a long time, the precious tears poured down his face. No one dared to ask him why. In the end, he explained his lachrymose behavior to his war-like leaders. ’My faithful servants,’ said he, ‘Do you know why I wept so bitterly? I am not afraid that these ruffians will be able to do me harm, but I am sick at heart to think that even in my lifetime they have dared to attack this coast, and I am horror-stricken when I foresee what evil they will do to my descendants and their subjects.’”

Most historians question whether Charlemagne did in fact witness such an event, but the message conveyed to us by Notker is clear: the Vikings posed a real danger to the coastlines of Western Europe even before the accession of Louis the Pious. The terror they struck in the hearts of their victims paints a picture of a threat that no one in Christendom had predicted.

The first recorded attacks at Lindisfarne in 793 A.D., in Ireland in 795 A.D., and in France in 799 A.D. are widely considered the beginning events of what historians call the Viking Age. Though the Viking Age lasted for nearly three centuries, the initial raids between the years A.D. 793 and 835 occurred peripherally, meaning they remained contained to coastlines (in contrast, the second half of the 9th century was marked by invasion attempts and conquests). This is the period that is most romanticized in popular culture: longships filled with rugged bands of marauders suddenly appearing on the horizon to sack and loot monasteries for their silver. That they appeared suddenly in the historical record has launched historians, archeologists, and various fields of science on a quest to answer the question: What caused the Viking Age?

Most historians draw upon a combination of several hypotheses to explain the cause of the Viking Age. These hypotheses range in scope from territorial disputes to diplomatic tensions with neighbors, and nearly all of these factors seem to have played a part. Not unlike Europe on the eve of World War I, Scandinavia in the late 8th century appears to have been ready to boil over, and all the situation needed was a catalyst. Unfortunately, attempts to define a single catalyst or trigger event have all proved unfruitful. A 2010 paper by the archeologist James Barrett called such attempts “unrealistic” and proposed the start of the Viking Age could only be defined by combining numerous factors into a broader, more general theory. 

What caused the Viking Age? The best we can say is that it was a combination of numerous factors, including climate change, trade, political strife, social stratification, among other causes. Here I will explore a few that served as likely significant contributors to what started the Viking Age.

Climate Causes

For as long as the study of the Vikings has existed, historians have proposed a short period of climatic warming as a primary longue-durée cause of the Viking Age. Indeed, most books about Viking history will include some variation of the hypothesis. While not a catalyst for the events of the late eighth century, the warming period may have contributed to societal developments in Scandinavia that caused societal duress during the ensuing cooling period. 

The long-term effects of climate, however, have come under scrutiny from several camps. A 2013 study by the historians Morgan Kelly and Cormac Ó Gráda argues too little evidence exists to correlate climate with social and political changes in the early medieval period. They acknowledge the impact climate change would have had on medieval society if it were a provable phenomenon, but stress that more research must be conducted to keep the climate hypothesis alive.

Social and Cultural Causes

Several leading theories on what caused the Viking Age focus on the social causes born from early Scandinavia’s stratified society and warrior culture. In a 2015 paper, historian Steven Ashby proposed social capital acquired through fame and glory drove sea captains to raid abroad. In the article, he writes, “In the flexible hierarchies of the Viking Age, those who took advantage of opportunities to enhance their social capital stood to gain significantly. The lure of the raid was thus more than booty; it was about winning and preserving power through the enchantment of travel and the doing of deeds. This provides an important correction to models that focus on the need for portable wealth; the act of acquiring silver was as important as the silver itself.”

Other social traditions may have also played a significant role in encouraging young men to raid abroad. The bride price — the price paid by a man to a woman’s family for her hand in marriage — may have precipitated the desire by young men to join sea captains on raids. The treasures they brought home would have paid the bride price for the woman they wanted to marry. In a 2017 paper, historians Ben Raffield, Neil Price, and Mark Collard proposed operational sex ratios driven by polygyny and concubinage led to the need for young men to seek treasures abroad to afford the bride price and increase their chances at marrying. 

In a 2016 essay, Søren M. Sindbæk suggested silver was used to establish and maintain social networks over time in Viking Age Scandinavia, bride prices being an example of such networks. If true, then the influx of Islamic silver from the East and controlled by the elites likely contributed to the need for young men to seek their own treasures in the West to compete.

Political Causes

In 782 A.D. Emperor Charlemagne was just wrapping up his conquest of modern-day Poland when the Saxons, under the leadership of a man named Widukind, rebelled against him. According to the Royal Frankish Annals, Charlemagne’s response was swift and bloody. During their battle near the Elbe River, the Franks took 4,500 prisoners. To teach the rebels a lesson, Charlemagne ordered the prisoners be baptized in the Elbe. The priests recited their benedictions, and the Frankish soldiers held their victims underwater until they drowned.

The event, after that dubbed “The Massacre of Verden” was no more gruesome than many of the other acts committed by the Carolingians. Forced baptisms and conversions were commonplace under Charlemagne’s rule. But Verden was different. The leader of the Saxons, Widukind, was brother-in-law to the king of the Danes, Sigfred. News of the massacre undoubtedly reached the Danish court, and as such would have (and this is conjecture) deeply angered them. It was yet another brutal, violent display of power by Charlemagne, the latest in a long series spanning decades.

Danish raids along the coast of Frisia (modern-day Netherlands) appear to have intensified almost immediately, leading to an infamous assault on the important trade port of Dorestad. The very next decade, an attack on Lindisfarne occurred, and what happened there has led some to believe that there may have been a connection between the two. A source on the attack by the twelfth century English chronicler, Simeon of Durham, who drew from a lost Northumbrian chronicle, described the events at Lindisfarne this way:

“And they came to the church at Lindisfarne, laid everything to waste with grievous plundering, trampled the holy places with polluted steps, dug up the altars and seized all the treasure of the holy church. They killed some of the brothers, took some away with them in fetters, many they drove out, naked and loaded with insults, some they drowned in the sea…

Some have proposed the drownings symbolized the forced baptisms at Verden. The evidence, however, is inconclusive. What is undeniable is that interactions between the Danes and the Franks, and the kingdoms of the British Isles, predated the official start of the Viking Age. Political strife may have served as an important trigger.


More recent scholarship on the subject of trade has revealed less apparent causes for the start of the Viking Age. A 2018 study by Irene Baug, Dagfinn Skre, Tom Heldal, and Øystein J. Jansen examined the location and provenance of whetstones to establish probable trade ties between geographic regions across the Baltic region. Most of the whetstones analyzed originated from the settlements of Lade and Borg in what is today Northern Norway. Dating of the quarry sites and the stones reveals the whetstone trade had likely established ties between these remote regions of Scandinavia and the more urbanized southern Baltic regions, such as Ribe, as early as the beginning of the 8th century. The study authors offer further evidence of these ties by citing the discovery of a reindeer antler comb from Norway found in Ribe, Denmark that predates the presupposed timeline for the establishment of trade.

If trade between Lade and the English Channel, even if not direct, had been established in the 8th century, the resulting contact from that trade could have inspired sea captains to shift their focus from trading to raiding, as was often done when the latter proved more worthwhile. As the study authors note: “This evidence, set in the context of the contemporary surge in production and trade around the southern North Sea and English Channel, the early urbanisation in southern Scandinavia and the Baltic, and the political integration in southern and western Scandinavia, allows us to suggest immediate reasons for why Viking ship commanders turned their activities overseas in the late 700s. The evidence also sheds light on why, after the initial ‘scouting phase,’ raiding in three decades since c. 806 took place predominantly in Ireland and Scotland, and why Vikings in the mid-830s began overwintering overseas and took up raiding in England and the Frankish Empire.”

Bringing it all together: What caused the Viking Age?

No single event or trend caused the Viking Age. Why sea captains and their crews launched from Scandinavia to raid abroad has its roots in a wide breadth of social, political, environmental, and cultural trends. Much more research is needed to peel back the shroud of mystery surrounding why longships appeared so suddenly off the coasts of England, Ireland, and France in the late 8th century.

For further reading, be sure to check out my selected bibliography on Viking History.



  1. Michael

    I was about to ask which sources tell us about the “deep hatred for the Christians”. After reading the rest of the post, I no longer need to ask the question. After the Elbe, I wouldn’t be a fan of Christians either.

  2. Bente Sjursen

    Interesting article. It was news to me that the monks from Lindesfarne was drowned in the sea ( an eye for an eye? ). I remember reading something similar to this a few years ago. The theory was, like yours, that the incident at the Elbe was the last straw that triggered the attack on Lindesfarne and the beginning of the Viking Age.

    In the centuries before the Viking Age , in addition to the improvement in climate and technology ( including the production of iron and ships), the increasing trading activities of the people who lived in Scandinavia had led to a significant increase in its population. Before the incident at the Elbe, Christian rulers had introduced several laws that led to the ban of Pegan traders in Christian countries. In the beginning it was sufficient for the Pegan traders to conduct a Christian baptism. Later were required to be practicing Christians. This meant that the population in Scandinavia did not get the necessities via trade which they depended.

    And when it finally was the threat of being invaded, forcibly converted to Christianity and even slaughter, the choice was to defend themselves. And the best form of defense is known to be attacking, yes?

    Construction of Danevirke support the theory of threat to Pegan Scandinavia from the Christians, decades before the Viking age( year 793 ). Danevirke is one of the largest military facilities in North Eruope from prehistoric times and consists of several embankments with a total length of approx . 30 km to effectively block the overland access to Denmark. According to written sources, work on the Danevirke was started by the Danish King Gudfred in 808. Fearing an invasion by the Franks, who had conquered heathen Frisia over the previous 100 years and Old Saxony in 772 to 804. Carbon-14 dating however dates the initial construction to be in the second half of the 7th century, and Dendrochronology suggests that construction began not very long after 737.

    Your article has made me look at both the invasion threat and the trade embargo teory. From year 0 expanded agriculture and especially grain cultivation in Norway followed by population growth. Your information about Charlemagne’s conquest of modern day Poland, as well as northern Germany, leads me to believe that there may be more to the trade embargo than I can find sources for. Especially for coastal Norway who do not have land areas particularly well suited to grain cultivation. Trade routes from these areas went to Rome Kingdom / Germany / France in the period 0-800 AD. Later, the trade routes went east to eg. Russia. These parts of Norway where most of the people lived, had perhaps become dependent on imported grain to feed the growing population. Periods of shortage of imported grain has been a problem for coastal Norway, and especially northern Norway until the end of the Napoleonic Wars. The large increase in potato cultivation as of 1840, ending the possibility of periods of famine and led to a large increase in population, with subsequent emigration to America from 1860 to 1910. Norway and Ireland had the highest emigration to America, compared with the proportion of the population. It is said that this was caused by the potato.

    After an evening of reading your article and research in various theories of what started the Viking era, I believe that the aggressive actions/politics from Charlemagne and other Christian kings against Pegan populations / countries necessitated a response for survival. If it just had been an famin caused by nature, I belive people will have emigrated, peacefully.

    • CJadrien

      Wow, great comment!

      I think what you are doing is the right thing to do: looking for multiple plausible causes to the Viking Age. As I mentioned, most historians think that a combinations of all of the above contributed to the Viking raids. And yes, Charlemagne’s bellicose foreign policy undoubtedly threatened the Danes. In fact, the Danes were raiding the coasts of Frisia as early as the 780’s, although these are not generally attributed to the Viking Age because they were considered to be ‘business as usual’. They coincided of course with the bans on pagan trade in Christendom.

      I encourage you to continue your research for it is incredibly interesting material, and we are all enriched for it. Thank you for your post!

      • Jesse

        Your article was interesting. Where did you get your source that Charlemagne drowned the Saxon prisoners? I searched the internet and I couldn’t find it anywhere.

    • Hope

      I agree!

  3. Peter Kvint

    The Vikings said even to scythe meant that a man could do 12 man’s work. This means that with one could be 92% of the population released to military service in the summer.

  4. Elly Dinh

    Impressive article. I always wonder Where and When Viking age started. And now I find my question. Thank you a lot

  5. Bjarke

    First off all check fact before writing anything about the viking age.

    New study now proves the the viking age started in Denmark in 725

    And the reason why the viking age started was because they started to make sails, so they could travel longer



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