Halfdan is one of the best-known names of the Great Heathen Army, and yet he is surprisingly hard to pin down in the sources: the English chronicle names him in only a handful of places, his end is never recorded under his own name, and everything that makes him a son of Ragnar Lodbrok comes from later centuries. This article lays out, passage by passage, what the chronicle, Asser, the Irish annals and the excavations actually say, and marks every interpretation as an interpretation.
Anyone writing about Halfdan is writing about a man whose name looks different in every language. The Anglo-Saxon Chronicle, a year-by-year record kept in Old English and usually dated to the reign of Alfred the Great, writes Healfdene or Halfdene. Asser, the Welsh cleric who composed a life of Alfred in 893, follows it for these years in large part and, in Albert S. Cook's English translation, also writes Halfdene. The Norse form is Hálfdan, usually explained as "half-Dane". The Irish annals know an Albann, whom most scholars identify with Halfdan. And the Annals of Fulda have a Halbdeni under 873, about whom it is an open question whether he was the same man. We will come to each of these equations; they are the real core of the Halfdan problem.
First, the plain inventory. In the Anglo-Saxon Chronicle the name Halfdan appears under 871 at the battle of Ashdown, under 875 when he marches into Northumbria with part of the army, under 876 when he shares out the land of the Northumbrians, and under 878 when an unnamed brother "of Ivar and Halfdan" falls in Devon. Asser has the same stations, plus the campaign against the Picts and the Britons of Strathclyde. Apart from the Irish material, that is practically everything reported about him close to his own time. Whoever reads "Halfdan, conqueror of York" is therefore reading a composite assembled from fragments, not a biography.
Then there is what the texts do not say. No near-contemporary source names Halfdan as leader of the landing of 865, none names him at the capture of York, none at the killing of King Edmund of East Anglia, and none gives his year or place of death under his English or Norse name. That does not disprove that he was there. It means that wherever he enters the narrative we should ask who says so and when the text was written. For the wider setting see the article on the Great Heathen Army; the family of the brothers is treated in Ragnar's sons.
That Halfdan and Ivar were brothers is not a saga invention. Under 878 the chronicle and Asser report a Viking leader who came to Devon with twenty-three ships (Asser has him arriving from Dyfed in Wales) and was killed in front of an English fortress. Asser calls him, in Cook's translation, "the brother of Inwar and Halfdene", and the chronicle of Æthelweard, written in Latin toward the end of the tenth century, likewise speaks of a brother of Inwær and Healfdene. Æthelweard's ship count differs: a summary of the chapter gives thirty ships instead of twenty-three, and I have not checked the Latin myself. The man himself stays nameless. That he later becomes "Ubba" goes back to later authors such as Geoffrey Gaimar, not to the chronicle.
So the brotherhood of Halfdan and Ivar rests on two early witnesses, who may however depend on each other, since Asser used the chronicle. That is all. Whether the brothers were brothers in the narrow sense or whether "brother" describes an alliance, the texts do not let us decide. More on Ivar can be found in the article on Ivar the Boneless.
The father is a different chapter. Neither the chronicle nor Asser names him. That Halfdan was a son of Ragnar Lodbrok comes from Norse tradition written down several centuries later. Scholars are divided: some consider parts of the Ragnar story historically rooted, others, such as Holman, see Ragnar as a composite, literary figure; this is how the English Wikipedia reports it, and I use it here only as a signpost. For this article, "Halfdan Ragnarsson" is the customary scholarly label, not a name secured by the sources.
The same caution applies to the other brothers. Björn Ironside is unknown to the chronicle; he appears only in Norse sources and in William of Jumièges's history of the Normans around 1070, as our article on him shows. Ubba appears in Abbo's Passion of St Edmund (around 985). Hvitserk, "White Shirt", is a son of Ragnar in the sagas; some scholars take the name for a byname of Halfdan, others for a separate person. Neither reading can be proved.
In the autumn of 865 a "great heathen army", as the chronicle puts it, landed in East Anglia and took winter quarters. The locals made peace with it and, according to the entry for 866, supplied it with horses. At this point Asser claims that the fleet came "from the Danube"; the English Wikipedia reads this as a corruption of Denmark (Dania), a suggestion I have not checked against the manuscripts. Halfdan is not mentioned.
The army turned north, into a kingdom that was in the middle of a civil war. The chronicle's entry for 867 describes the situation tersely: the Northumbrians had driven out their king Osberht and accepted Ælla; when the army moved against York, the two kings joined forces, attacked, and fell. The survivors made peace. Symeon of Durham, who wrote only in the early twelfth century, gives 21 March 867 as the day of the battle and calls Ælla a "tyrant"; I know this only from quotations in Wikipedia, not from reading Symeon. The date on which York was taken before the battle is given in the literature as late autumn 866 or as 867; the chronology is disputed.
What matters for our question: the chronicle names no army leaders. Symeon, in his list of leaders, gives Halfdene, Inguar, Hubba, Beicsecg, Guthrun and further names, but he wrote more than two hundred years later and strings well-known names together. A role for Halfdan in the fall of Ælla and Osberht cannot be derived from that, and it would be wrong in substance to speak of a "fall" at all: Osberht had been deposed beforehand by the Northumbrians themselves, both kings died in battle, and the chronicle does not report an execution. The Norse tale of the blood eagle, in which Ragnar's sons kill Ælla cruelly, is later tradition; the scholar Roberta Frank has proposed that it goes back to a misreading of a poetic circumlocution for an enemy lying dead on the battlefield. That is an interpretation worth knowing, not a fact. For York as a place, see the article on Jorvik.
The following years are a chain of winter camps. The army wintered at Nottingham in 868, where King Burgred of Mercia called on the West Saxons for help and the Mercians in the end made peace; it returned to York, then moved to East Anglia and killed King Edmund in 869 or 870. The manuscripts' year counts are offset against each other, which is why the sources waver between those two years. In the English translation of the chronicle that I consulted (Avalon Project), the entry for 870 names "Hingwar and Hubba"; other versions are briefer. Halfdan is absent here as well. In the same stretch Æthelweard records the death of an "Inwær"; according to the summary I read, in 870. That would contradict the equation of Ivar with Ímar of Dublin, who according to the Annals of Ulster died in 873. I have not checked the passage in the Latin and leave it open.
Why this matters for Halfdan: his first secure appearance in the chronicle is 871. Everything before is inference. If Halfdan was present in 865, as scholars mostly assume, that is an assumption drawn from the brother formula and from his later prominence, not a statement of the sources.
The army reached Reading, at the confluence of the Thames and the Kennet in Wessex, at the end of 870. Asser reports that two of its earls rode out to plunder while the rest dug in between the rivers. Ealdorman Æthelwulf of Berkshire defeated the raiders at Englefield; shortly afterwards the West Saxons were beaten at Reading itself, and Æthelwulf was among the dead. An ealdorman, a royally appointed governor of a shire, was the most important official in Wessex below the king; earl (Old Norse jarl) denotes, on the Norse side, a high-ranking commander who is not a king.
Four nights after Reading, in the chronicle's words, came the battle of Ashdown, whose location is still disputed; it is usually sought on the Berkshire Downs, but that is not proved. Here Halfdan appears in the text for the first time:
"In the one [force] were Bachsecg and Halfdene, the heathen kings, in the other the earls."Anglo-Saxon Chronicle, manuscript A, year 871 (Old English: on oþrum wæs Bachsecg 7 Halfdene þa hæþnan cyningas, on oþrum wæron þa eorlas; public domain; own translation; spelling after a textbook excerpt)
So the army stood in two groups, the kings in one, the earls in the other. According to Asser, King Æthelred of Wessex was to face the kings and his brother Alfred the earls. Asser tells that Æthelred was still hearing mass in his tent and that Alfred charged ahead "like a wild boar" without waiting. The Danes held the high ground, and the fighting centred on a single low thorn tree. In the end one of the two kings, Bagsecg, fell, together with five earls: Sidroc the Elder, Sidroc the Younger, Osbern, Fræna and Harold. Halfdan survived, and that is everything the sources say about his personal part.
What follows from this? First, that Halfdan in 871 was a "heathen king", as the chronicle puts it. Second, that he shared command with Bagsecg. The chronicle also mentions for 871 a reinforcement from overseas, the "great summer army". Whether Bagsecg led it is presented differently in the literature; according to the summaries I read, the chronicle does not say. It also does not say which of the two kings held the supreme command. The chronicle counts nine "general battles" south of the Thames that year but names only a few; which of the single engagements Halfdan led cannot be read out of it. The English Wikipedia attributes Basing and Meretun (Merton) to him, but I could not trace that attribution in the chronicle.
Soon after Easter 871 King Æthelred died, and Alfred succeeded him. The West Saxons made peace, and the army moved from Reading to London and wintered there in 871/72. I have not checked whether the coins connected with this London winter camp bear Halfdan's name, so I leave that question open.
From 872 two winter camps followed that have been understood afresh in recent years. The chronicle mentions Torksey in Lindsey (872/73) and Repton (873/74) in a sentence each, without naming a leader. Halfdan is not mentioned in either entry. Whoever places him there is reasoning from context: he was king of the army in 871, he left Repton for the north in 874/75, so he will have been present. That is plausible, but it is an inference.
Torksey on the Trent was investigated by Dawn Hadley and Julian Richards, who presented the results in 2016 in the Antiquaries Journal. The camp lay on a natural rise with marsh on several sides and the river to the west and covered about 136 acres, roughly 55 hectares. Finds include more than 120 Arabic silver coins (dirhams), at least 60 pieces of hack-silver, a dozen pieces of hack-gold and several hundred weights; hack-silver is chopped silver used as payment by weight. The authors conclude that not only warriors camped here but also traders, craftspeople, women and children, and one of them speaks of something "almost like a town on the move". No defensive earthwork was found, and the camp was much larger than that at Repton. They put the number of people "at least in the thousands". That is a counterweight to older estimates of a few hundred, which rested on the assumption that the chronicle exaggerates.
Repton in Derbyshire was excavated by Martin Biddle and Birthe Kjølbye-Biddle between 1974 and 1993. They found a D-shaped ditch abutting the church of St Wystan; fortifications of similar shape are known from Hedeby and Aarhus, though larger there. In the vicarage garden a mound covered a charnel deposit with the commingled bones of at least 264 people, mostly men aged 18 to 45; five silver pennies dated 872–874 belonged to the find. Beside the church lay a double grave (G511 and G295); one of the dead had a sword, a silver Thor's-hammer pendant and a boar's tusk, and bore severe wounds. Biddle and Kjølbye-Biddle considered that the centre of the complex might belong to Ivar the Boneless; that is a proposal, not a finding. Newer work (Antiquity 2018) corrected radiocarbon dates for the marine reservoir effect and thus supports the ninth century; strontium values point to a mostly non-local origin. A 2019 article in Current Archaeology reports that the two men of the double grave were genetically father and son or half-brothers and died between 873 and 886; as a pure hypothesis the names Olaf and Eysteinn were put forward.
Halfdan appears in none of these reports. That is itself a statement: the excavations show the world he moved in, but no find can be tied to his name. Whether Torksey and Repton were the setting in which he made policy remains an assumption. For land and warfare of these years, see Vikings in England.
Here the chronicle says what it has never said before: the army broke up at Repton. Healfdene went into Northumbria with one part and took winter quarters on the Tyne; Guthrum, Oscytel and Anwend, in Asser's words three kings of the heathens, went to Cambridge. Asser adds that Halfdene's group subdued Northumbria and ravaged the Picts and the Britons of Strathclyde. "Britons of Strathclyde" means the inhabitants of the kingdom of Alt Clut around the River Clyde. Which places Halfdan touched on the way, the early sources do not say; later accounts that name Tynemouth or Jarrow I know only from summaries and do not present them here as findings.
In the same period the Annals of Ulster record that the "dark foreigners" met the Picts in battle and a great slaughter of Picts resulted. Whether these Norsemen had anything to do with Halfdan's campaign the annals do not say; it is a link one may draw, but need not.
What the political situation in Northumbria was like is unclear because the sources are thin. According to Wikipedia's summary of the scholarship, after 867 the Vikings had installed a compliant king named Ecgberht, whom the Northumbrians expelled in 872; later a certain Ricsige is said to have ruled. The evidence is late, above all Symeon of Durham and Roger of Wendover, and the dates are regarded as uncertain. A link between a revolt against Ecgberht and the army's return in 872 is asserted but not secured; the war in Mercia could equally have been the reason.
The most consequential sentence about Halfdan stands in the chronicle under 876: Healfdene shared out the land of the Northumbrians, and from then on they ploughed it and supported themselves. We know it in this form also from Cook's translation of Asser, there with the addition that Halfdene, "king of that part of Northumbria", divided the whole region between himself and his men and settled there with his army. Æthelweard, in the summary I read, adds that Halfdan did this "having subdued all men". An older English translation of the chronicle turns the ploughers into "harrowers and plowers". Which verb stands in the Old English text I have not checked against the original; the discrepancy is a warning against translations that run too smoothly.
What does "sharing out" mean? The chronicle does not explain. The usual reading is that the warriors became landholders; for Mercia in 877 and East Anglia in 880 the chronicle uses similar wording. That an army settled here does not mean that every warrior became a farmer. Whether land was taken from its former owners the text does not say; by the usual interpretation it happened chiefly in Deira, the southern part of Northumbria with York. How many of these settlers were Danes, whether they came as families or as individuals, and how much of the place-name evidence in -by and -thorpe goes back to this division cannot be answered, since place-names cannot be dated to a single year. The result, the later Viking kingdom of York, is covered in the articles on Jorvik and the Danelaw.
Did Halfdan thereby also become "king of York"? Asser calls him king of one part of Northumbria; the chronicle gives him no title at this point. "King of Jorvik 876 to 877" is a common attribution in modern literature that does not appear in the sources in this form. Symeon of Durham, whom I know only through Wikipedia, relates that Ecgberht II ruled in the north beyond the Tyne and that after Halfdan's departure the follower Guthred was made king in York only in 883. The historian Nick Higham reads this Guthred story not as a factual report but as a reflection of a later settlement. Speaking of Halfdan's "successor" is therefore a construction.
This is where it gets difficult, because Halfdan's death is not reported in England. The Anglo-Saxon Chronicle is silent on his end. The Annals of Ulster contain two entries that are related to him. The first, in the annals' own count under the year 875 (CELT: U875.4), reads in the English translation: "Oistín son of Amlaíb, king of the Norsemen, was deceitfully killed by Albann." The second, U877.5, speaks of a skirmish at Loch Cuan, today's Strangford Lough in County Down, "between the fair heathens and the dark heathens, in which Albann, king of the dark heathens, fell". Neither entry contains the name Halfdan.
The equation of Albann with Halfdan rests, as far as I can survey the reasoning, on the form of the name and on timing: after 876 Halfdan vanishes from the English sources. According to the English Wikipedia, Ashley South speaks of "general agreement"; Clare Downham presupposes the equation when she interprets the killing of Oistín as a family dispute. Against that: no text says it explicitly. The dating is a further problem. The online edition of the annals (CELT) adds "AD 876" after U877 and "AD 874" after U875; the annals' count in this period is offset by about a year from ours. The literature mostly says 877. Whoever reads "877" is therefore reading a convention, not an undisputed year. This is compatible with the chronicle: Halfdan shares out Northumbria in 876, and a departure for Ireland in the same or the following year would be possible, but the sources do not connect the two events.
A family feud is suggested as the background. Oistín was a son of Amlaíb, according to the annals king of the Norsemen in Ireland; Amlaíb and Ímar are seen in scholarship as brothers, and if Ímar really is Ivar, Halfdan's victim would have been a nephew of Ivar. As our article on Ragnar's sons already notes, that is a calculation with two assumptions. Clare Downham links the killing of Oistín to a struggle for rule in Dublin that ended in 877 at Strangford Lough; that is her interpretation. The roles of the "fair" and "dark" heathens are gladly read in scholarship as a contrast between Norwegians and Danes; that is not secured. A later text, Cogad Gáedel re Gallaib, composed in the twelfth century, knows Halfdan as "son of Ragnall" and names Bárid, son of Ímar, as his opponent; the Fragmentary Annals, by contrast, give Gofraid as the father of the brothers. These details come from the English Wikipedia, which cites Downham and South there, and are to be read with that reservation.
It has to be said plainly: Halfdan's death is not attested, it is inferred. The annals report the death of an Albann. That he was Halfdan Ragnarsson is very probable, but it is an equation. Chronicle and annals do not touch at any point.
Halfdan was a common name. The Annals of Fulda record under 873 Danish envoys of two kings, Sigfred and Halfdan, to Louis the German. According to Wikipedia's summary, which I could not check against the text, Sigfred's envoys came to Worms at Easter and asked for free trade for Danish merchants in Saxony; Halfdan's envoys appeared in August at Metz, presented a sword with a golden hilt and asked that the brothers be accepted as the king's "sons". Whether this Halfdan was the army leader in England is open. In favour are the name and the fact that the English sources do not mention him in 873; against it, that the Annals of Fulda do not touch England with a single word and that Halfdan was a common name. Rory McTurk considers the equation "almost certain"; that is not proof. What counts here is what the annals say: that a Halfdan, as a king in the Danish sphere, asked for peace, not that he had left England.
The saga Halfdan is an avenger. According to Ragnarssona þáttr, an Icelandic text of roughly the thirteenth century, Ragnar Lodbrok was thrown into a snake pit by King Ælla in England; his sons conquer York and kill Ælla cruelly. The English sources know neither the snake pit nor the revenge. They know two kings who fell at York fighting an army. The idea of a family revenge expedition also first appears centuries later. Whoever wants to bring the saga image into line with the chronicle has to build several bridges, and each is a hypothesis: Ragnar existed, Ælla killed him, Halfdan was his son, the campaign of 865 was a revenge expedition. I have not found any of these bridges in the text of the sources. The source layers themselves are laid out in the article Ragnar's sons.
What the chronicle image offers is less narrative and for that reason sturdier: a man who takes part in a battle in 871, then, in a division of the army, leads one part north and shares out land there. A warrior who did not conduct raids but set up rule. That this has little to do with the tale of an avenger is no argument against the saga, but it is an argument against assuming that both tell the same story.
One more demarcation, because it matters for the Aachen region. The army that sacked Aachen in the winter of 881/82 and lay at Asselt on the Rhine was not Halfdan's army. The Annals of Fulda name Godfrid and Sigfred as leaders of the attack on Aachen; the story is told in Vikings in Aachen 881, the connection with the mainland in The Great Army on the Continent. Even if Halfdan's death in 877 holds, he would long have been dead in 881, and no source I have read puts him on the Continent. The name Sigfred does also appear in Fulda in 873 next to Halfdan; whether the Sigfred of 873 and the one of 881 are the same man I have not investigated. The term "Great Army" is used in the literature for both, but on what the sources show they are different bodies.
Five questions remain unresolved, and honesty requires not covering them over. First: was the Healfdene of the chronicle the same man as the Albann of the annals? Probably yes; it is not proved. Second: what part did Halfdan play at York in 866/67 and in East Anglia in 869/70? No near-contemporary source says. Third: what does "sharing out land" mean in practice, and how many people settled? Figures are lacking. Fourth: who were the dead at Repton, and were Halfdan's men among them? No find bears his name. Fifth: when exactly did he die, 876 or 877? The count of the annals permits both.
Who was Halfdan Ragnarsson? A leader of the Great Heathen Army, whom the Anglo-Saxon Chronicle calls Healfdene. He is mentioned in 871 at Ashdown, led part of the army to Northumbria in 875 and shared out the land there in 876. The name "Ragnarsson" comes from later Norse tradition.
Where and when did Halfdan die? Probably in 877 (by the annals' count possibly 876) at Strangford Lough in Ireland. The Annals of Ulster, however, name only the "Albann" who fell there; the identification with Halfdan is a reasoned assumption.
What happened in Northumbria in 876? The chronicle reports that Halfdan shared out the land of the Northumbrians and that his men have tilled it since. How many settled and how the land was distributed, the text does not say.
Was Halfdan at Repton? The chronicle names Repton as the army's winter camp in 873/74; Halfdan is not expressly mentioned there. After the winter he separated from the rest of the army and went north.
Did Halfdan's army sack Aachen? No. According to the Annals of Fulda, the army that lay in the Rhineland in 881/82 had other leaders. By the usual dating Halfdan was already dead.
The brothers and the army: Ivar the Boneless, Ragnar Lodbrok, Ragnar's sons, Björn Ironside and The Great Heathen Army. The land afterwards: Jorvik, Danelaw, Vikings in England and Alfred the Great. The other army on the Rhine: Vikings in Aachen 881 and The Great Army on the Continent.
Ivar the Boneless · Ragnar's sons · The Great Heathen Army · The Norse of Jórvík · Alfred the Great.
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