List of legendary kings of Denmark
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The legendary kings of Denmark are the predecessors of Gorm the Old, half history and half legend. The accounts of the Danish kings are confusing and contradictory, and so this presentation tries to separate the various sources from each other. They sometimes mention the same kings.
Many kings are mentioned by multiple sources, but are for various reasons still considered more legendary than historical kings of Denmark
- Harthacnut (da: Hardeknud) (c. 916 – c. 936) The father of Gorm the Old according to multiple sources, the main question is whether he was king of Denmark or only king of some part of Denmark. His parentage is also disputed, as either from an unknown king Sweyn, or from either Sigurd Snake-in-the-Eye or king Erik, both said to be children of Ragnar Lodbrok.
- Sigtrygg Gnupasson (Deposed c. 916) either by Harthacnut or contemporary depending on sources. Likely had base in Schleswig, but the extent of his realm is unknown. Son of Gnupa.
- Gnupa (early 900s) father of Sigtrydd, according to one source shared the power with his brother Gyrd. According to Gesta Danorum, he was defeated as one of the minor border kingdoms by Gorm when he united Denmark, though that conflicts with Gnupa's son being deposed by Gorm's father according to other sources.
- Olof the Brash Conquered Denmark (or part of Denmark) c. 900.
- Helgi Possibly deposed by Olaf the Brash.
- Sigurd Snake-in-the-Eye (da: Sigurd Orm-i-øje or Snogeøje). Became king of Zealand and Scania c. 871 after the death of Bacsecg, and succeeded his brother Halfdan Ragnarsson as king of Denmark c. 877. Mentioned by Chronicon Roskildense and Ragnarssona þáttr. Son of Ragnar Lodbrok.
- Halfdan Ragnarsson (c. 871 – c. 877) son of Ragnar Lodbrok and older brother of Sigurd Snake-in-the-Eye. Leader of the Great Heathen Army in 870 and 871. King Bagsecg joined him to become the co-leader of the Great Summer Army of 870 but Bagsecg was killed in battle with the English in January 871. Halfdan succeeded Bagsecg as king of Jutland.
- Bagsecg king of Jutland, Zealand and Scania from about 867 to 871.
- Horik II king from about 854 until about 867.
- Horik I said to have been the sole king of Denmark c. 827 to c. 854. Son of Gudfred.
- Harald Klak King in Jutland c. 812 to c. 827 (a period of civil war between the grandsons of Sigfred). Nephew of Gudfred.
- Hemming Halfdansson c. 810 to c. 812. Nephew of Gudfred. Brother of Harald Klak, Reginfrid and Anulo.
- Gudfred (da: Godfred or Gøtrik) a Danish king c. 804 to c. 810. Said to be father of Ogier the Dane (da: Holger Danske), and son of Sigfred.
- Ragnar Lodbrok was a legendary king (c. 804 to c. 865). He is mentioned in multiple sources, but the sources are wildly inconsistent. There is no historical record of anyone named Ragnar ruling Denmark in the 9th century. However his sons Halfdan Ragnarsson and Sigurd Snake-In-the-Eye did become kings of Denmark, and his son Bjorn Ironside became king of Sweden and Uppsala in about 865.
- Sigfred Danish king c. 770 to c. 804. Possibly the historical basis for Sigurd Hring. Reported to have assisted the Saxons against Charlemagne.
- Harald Wartooth (da: Harald Hildetand) Legendary king of Denmark, Sweden and Norway, c. 715 to c. 770. Mentioned in multiple sources. According to one source his conquests reached as far as the Mediterranean. Said to be grandfather of Ragnar Lodbrok.
- Ongendus was a king of the Danes, reigning c. 710, the first Danish king known from contemporary literature.
- Randver (early 700s).
- Valdar (early 700s). Son of legendary Scandinavian king Ivar Vidfamne.
- Ivar Vidfamne died c. 700. The Viking sagas say that Ivar Vidfamne ruled over most of Denmark, Sweden, Norway and even parts of England.
Rig and Scylding line
- Dan mikilláti, son of Danp – (He is brother-in-law of Domar.)
- Fróði mikilláti, son of Dan Mikillati
- Halfdan, son of Fróði
- Hroðgar (Roar), 6th century?, son of Halfdan
- Halga (Helge), 6th century?, son of Halfdan
- Hrólfr Kraki, son of Helga
After Hrólf Kraki no two sources give the same succession.
Adam of Bremen
- Olof the Brash (Olav/Ole den Frøkne): mention o. 925
- Gyrd and Gnupa: mention 934
- Sigtrygg Gnupasson (Sigerich): c. 935, but conflicts with Harthacnut's deposition of him about 917
- Harthacnut Very likely preceded Gorm the Old
- Dan I
- Frotho I
- Haldanus I
- Rolvo Krake
- Høtherus (and Balderus)
- Rørikus (the grandfather of Hamlet)
- Dan II
- Frotho II
- Dan III
- Fridlevus I
- Frotho III
- Fridlevus II
- Frotho IV
- Olavus I
- Haraldus I
- Frotho V
- Haldanus II
- Sywaldus I
- Haraldus Hyldetan (Harald Wartooth)
- Sywardus I
- Sywaldus II
- Haraldus III
- Gormo I
- Olavus II
- Siwardus Ring
- Regner Lothbrog
- Siwardus III
- Ericus I
- Ericus II
- Kanutus I
- Frotho VI
- Gormo II
- Haraldus III
- Gormo III
Chronicon Lethrense and Annales Lundenses
The kings from the Chronicle of Lejre.
- Dan, son of Ypper (a primeval king of Sweden)
- (Hadding) (only referred to)
- Ro (= Haldan)
- Haldanus (= Ro) in Lejre and sea-king Helghe, the sons of Ro (= Haldan)
- A dog king Raki, Rachus or Saurr ruled Denmark on the order of the Swedish king Adils (or Hakon)
- Snyo, son of Frosti
- Rolf Kraki
- Haki or Aki, brother of Haghbardus and son of Hamundus
- Frotha Largus (the Generous)
- Asa, queen
- Haraldus Hyldetan
- Hetha or Wysna, queen in Hedeby
Other manuscript have a supplementary list, following the name of Hartwar:
- Hother of Saxland, son of Hodbrod and Hadding's daughter, as nearest heir.
- Rorik Slengeborre or Rake
- Offe the Strong
The kings in epic poem Beowulf
- Heremod, a Danish king
- Scyld, a foundling who became king
- Scealdwea (Scealdea), son of Heremod
- Beowa, son of Scyld
- Healfdene, son of Beowa
- Heorogar, son of Healfdene
- Hroðgar, son of Healfdene
- Hroðulf, probably the son of Hroðgar's brother Halga
The kings in the poem Gróttasöngr
Skjöldunga saga (partial list)
The kings of the saga of the Scylding family.
- Fridleifus I
- Frodo I
- Frodo II
- Dan I
- Dan II
- Frodo III
- Fridleifus II
- Frodo IV
- Ingjaldus 
- Helgo and Roas
- Rolfo Krake
Sögubrot or Sǫgubrot af nokkrum fornkonungum Dana ok svíaveldi is an Old Icelandic saga fragment which is believed to be a part of the original Skjöldunga saga. The fragment begins in the middle of a discussion between the Scanian king Ivar Vidfamne and his daughter Auðr.
- Kings of the whole of Denmark or individual Danish regions, which appear in Sögubrot
- Helgi, (joint ?) king of Zealand
- Hrœrekr Ringslinger (brother of Helgi), king / (co-kingship) of Zealand
- Ivar Vidfamne (the father-in-law of Hrœrekr), King of Scania – later King of Denmark, Sweden, Norway and parts of several adjoining countries.
- Harald Wartooth (grandson of Ivar), he became king after Ivar (possibly identical with the "former" or "senior" King Harald mentioned in connection with the royal Danish brothers Anulo and Harald in the Royal Frankish Annals)
- Hring or Sigurd Hring (nephew of Harald Wartooth), at first king of Sveariket (Beowulf: Swēorice; oldest Swedish form: Swerike), later also king of Denmark (could possibly be identical with king Sigfred).
- At the end of Sögubrot is mentioned Ragnar (Ragnarr) as a son of Sigurd Hring. From other known sources it must be concluded that this Ragnarr is the famous Viking king Ragnar Lodbrok.
The kings of the saga of the Ynglinga family.
- Danr hinn mikilláti
- Fróði hinn mikilláti eða friðsami
- Áli hinn frækni
- Fróði hinn frækni
- Helgi Hálfdanarson
- Hrólfr kraki
- Chlochilaicus: 6th century killed by Theuderic I during a Viking raid in ca 516, mentioned as a Dane though that might have been be a mistake on the author's part. He is called 'Rex Getarum' (King of The Geats) in most accounts and is thought to be Hygelac, mentioned in Beowulf as the King of Geatland.
- Fróði: 6th century or 7th century
- Ongendus (Angantyr): mention early 8th century
- Siger: mention 8th century
- Sigfred (Sigfred/Sigurd): mention 776, d. before 804
- Harold: of Norway?
- Gudfred (Godfred): latest 804 – d. 810
- Hemming: d. 811
- Anulo (Anulo/Ring): d. 812
- Sigfrid (Sigfred/Sigurd): d. 812
- Harold: 812–815, died in exile
- Eric (Horik/Erik): o. 812, d. 854
- Halfdan (Halvdan) o. 812, possibly died in exile
- Eric the Child (Horik/Erik Barn): c. 854, mention 864, possibly d. 873
- Harald Fairhair (Harald I of Norway): o. 871, d. o. 933 by Norway
- Sigurd Snake-in-the-Eye (Sigurd Orm i Øje): mention 873, d. 903, do coin money by East Anglia
- Guichtlac: King of the Danes in antiquity. Cited In Book III of the Historia Regum Britanniae by Geoffry of Monmouth.
For later Danish monarchs whose existence is verified, see List of Danish monarchs
- Saxo Grammaticus, ed. Hilda Ellis Davidson, p. 165.
- The Chronicle of the Kings of Lejre, ed. Peter Tunstall.