The Royal Court of Denmark does not differentiate between different royal houses among the early Danish kings, but uses the term "the descent of Gorm the Old" about all the pre-Oldenburg monarchs.[3]
Background
The name of the Estridsen dynasty recalls their acquisition of the Danish crown through the marriage of Ulf the Earl to Estrid Svendsdatter of the House of Knýtlinga, daughter of Sweyn Forkbeard and sister of Cnut the Great. Later genealogies (introduced by the Danish historian Jakob Langebek in the 18th century)[4] trace the family from Jomsviking leader Styrbjörn the Strong, a scion of the Swedish royal family, who in turn is given a descent from legendary King Sigurd Hring, regarded as mythical by most modern historians (no actual sources mention such an ancestry). Reliable ancestry traces back no earlier than Ulf's own father, the obscure Thorgil Sprakling and grandfather Björn (in sources called Ursius), the latter thus alternatively being identified as the above Styrbjörn by Langebek.[4]
The dynasty reached its peak with the Kalmar Union, when its members reigned as kings of Denmark, Norway and Sweden in personal union. The dynasty came to end in 1412 with the death of its last member Queen Margaret I. All of the subsequent monarchs of Denmark are cognatic descendants of the House of Estridsen.
Magnus I (c. 1106 – 4 June 1134), Duke of Västergötland from 1125, King of Denmark from 1134, married Richeze, a daughter of Bolesław III Wrymouth
Canute V (c. 1129 – 9 August 1157), Duke of Jutland from 1147, co-ruler of Denmark from 1154, married in 1156 to Helena, a daughter of King Sverker I of Sweden
(illegitimate) Niels, Count of Halland from 1216 — descendants: the counts of Halland, died out in 1314
(illegitimate) Canute (1211 – 15 October 1260), Duke of Estonia from 1219, Duke of Blekinge from 1232, Duke of Lolland from before 1260, married Hedwig, a daughter of Swietopelk I, Duke of Pomerania — descendants: the Lords of Skarsholm, died out before 1408
Valdemar V (1314–1364), Duke of Schleswig from 1325 to 1326 and from 1330 to 1364, King of Denmark as Valdemar III from 1326 to 1330, married Richardis, a daughter of Gunzelin VI, Count of Schwerin
Valdemar (c. 1338 – 1360)
Henry (c. 1342 – August 1375), Duke of Schleswig from 1364
Ingeborg (1 April 1347 – before 16 June 1370), married Henry III, Duke of Mecklenburg (d. 24 April 1383), the grandparents of Eric of Pomerania, King of Norway as Eric III, King of Denmark as Eric VII, and King of Sweden as Eric XIII
Margaret I (March 1353 – 28 October 1412), Queen regnant of Denmark from 1375 to 1385 and from 1387 to 1396, Queen regnant of Norway from 1380 to 1385 and from 1387 to 1398, Queen regnant of Sweden from 1389 to 1396, co-founder of the Union of Kalmar in 1397, married in 1363 to Haakon Magnusson (d. 1380), King of Norway from 1355 as Haakon VI, King of Sweden from 1362 to 1364 as Håkan (they had one son who belonged to the Swedish dynasty)
(illegitimate) Erik Christoffersen Løvenbalk, his male line descendants, the Løvenbalk family, died out after June 1598; Frederick VIII, Duke of Schleswig-Holstein descends from him in the female line and his granddaughter married back into the Danish royal family
Richeza (d. before 27 October 1318), married Lord Nicholas II of Werle (d. 1316); Christian I of Denmark was their great-great-great-grandson, the current Queen Margaret II descends from Christian I
Martha (d. 2 March 1341), married in 1298 to Birger Magnusson (d. 31 May 1321), King of Sweden from 1290
^NE the Nationalencyclopedin article is clearly named in Swedish with Estridska ätten which translates with sufficient accuracy as "House of Estridsen"
^ abJacob Langebek (1774), Scriptores Rerum Danicarum Medii Ævi, vol. 3, pp. 281-282
^Steenstrup, Johannes C. H. R. (1903). "Svend Estridsen". In Bricka, Carl Frederik (ed.). Dansk Biografisk Leksikon (in Danish). Vol. 17. Kjøbenhavn: Gyldendalske Boghandels Forlag (F. Hegel & Søn). p. 4. Retrieved 2007-02-22. Sweyn died at the royal estate Søderup in [the Duchy of] Schleswig April 28, 1076 (the Danish annals have, certainly incorrect, 1074) and was buried in Roskilde Cathedral. [S. døde paa Kongsgaarden i Søderup i Slesvig 28. April 1076 (de danske Aarbøger have, sikkert urigtig, 1074) og blev begravet i Roskilde Domkirke.]
^Ræder, J. G. F. (1871). "Danmark under Svend Estridsen og hans Sønner (Copenhagen, pp. 202-203)". archive.org. Retrieved 2017-02-22. At Vilhelm er død før Kongen, meddeles af de ikke meget senere Skribenter Anonymus Roskild. (Lgb.I. S. 378) og Ætnothus (Lgb.III. S. 338). At fremdeles Svend Estridsen døde 1076 og ikke allerede 1074, er ligeledes hævet over enhver Tvivl; naar nu ikke destomindre en hel Række Kildeskrifter lader ham dø allerede 1074, saa synes dette at hænge sammen med det allerede tidlig opstaaede og hos Saxo opbevarede Sagn om, at Vilhelm døde faa Dage efter Kongen og af Sorg over hans Død. Det kan da tænkes , at man har draget Kongens Død tilbage til Bispens Dødsaar 1074, ligesom Nyere (t. Ex. Molbech, hist. Aarb. III S. 19) drage Bispens Dødsaar frem til 1076 for at faa Begges Dødsaar til at falde sammen." ... & ... "men derimod giver en ny Skrivelse, som Paven afsendte til Svend d. 17. April s. A. [1075], En det bestemte Indtryk, at der i Mellemtiden er foregaaet Noget, hvorved Svend har gjort sig Paven forbunden
Detlev Schwennicke: Europäische Stammtafeln, vol II, 1984, table 98 ff