The only statement of his paternity in the medieval literature is Saxo Grammaticus's Gesta Danorum (c. 1200), which asserts that Gudfred or Gøtrik was the son of a King Gorm; this figure, however, appears to be a duplicate of the much later Gorm the Old (d. c. 958). Henrik Schück identified Gudfred with a certain Gudfred the King, mentioned in an Irish genealogy in the Three Fragments (11th century), who in turn was the son of another Gudfred, according to Schück presumably a brother of Sigfred. Henrik Schück (1895), "De senaste undersökningarna rörande ynglingasagan" [1] The value of this genealogy is however debatable.
P.A. Munch (1941), Det norske Folks Historie Oslo: Instituttet for Historisk Forskning, Bd. II, p. 33 [2]; Henrik Schück (1895), "De senaste undersökningarna rörande ynglingasagan", Historisk Tidskrift 15, p. 76 [3]; Erik Kroman (1976), Det danske rige i den aeldre Vikingetid. Copenhagen: Rosenkilde og Bagger, p. 131, 156-7.
Henrik Schück (1895), "De senaste undersökningarna rörande ynglingasagan" [6], note 81.
Adamus, Gesta Hammaburgensis ecclesiae pontificum[4]Archived 2005-02-07 at the Wayback Machine, Liber I, Capitulum 16; Adam av Bremen (1984), Historien om Hamburgerstiftet och dess biskopar. Stockholm: Proprius, p. 28 (Book I, Chapter 14).
runeberg.org
P.A. Munch (1941), Det norske Folks Historie Oslo: Instituttet for Historisk Forskning, Bd. II, p. 33 [2]; Henrik Schück (1895), "De senaste undersökningarna rörande ynglingasagan", Historisk Tidskrift 15, p. 76 [3]; Erik Kroman (1976), Det danske rige i den aeldre Vikingetid. Copenhagen: Rosenkilde og Bagger, p. 131, 156-7.
Knud Togeby (1966), "Ogier le Danois", Revue Romane 1, p. 114 [20]
vsnrweb-publications.org.uk
Snorri Sturluson (2016), Heimskringla, Vol. I [18], p. 45-6.
Snorri Sturluson (2016), Heimskringla, Vol. I [19], p. 40.
web.archive.org
Adamus, Gesta Hammaburgensis ecclesiae pontificum[4]Archived 2005-02-07 at the Wayback Machine, Liber I, Capitulum 16; Adam av Bremen (1984), Historien om Hamburgerstiftet och dess biskopar. Stockholm: Proprius, p. 28 (Book I, Chapter 14).
