Gyda Anundsdotter of Sweden, also known as Guda and Gunhild (died c. 1048/1049), was a medieval and Viking Age Swedish princess and Danish queen consort, spouse of King Sweyn II of Denmark.
Biography There is little information about Gyda; our main source being the German ecclesiastic chronicler Adam of Bremen (c. 1075). According to the much later historian Saxo Grammaticus and the Icelandic annals, she was the daughter of the Swedish king, meaning Anund Jacob (1022 – c. 1050).Sven Axelson (1955), Sverige i utländsk annalistik 900-1400. Stockholm: Appelbergs, p. 34, 55-6. Her mother would then be Queen Gunhild of Sweden.Adam av Bremen (1984), Historien om Hamburgstiftet och dess biskopar. Stockholm: Proprius, p. 189 (Book III, Scholion 66). The near-contemporary Adam, however, does not say that Anund and Gunhild had any children. It is also possible that she was the daughter of Anund and another woman.
She was married to King Sweyn of Denmark, maybe in 1047 or 1048. The date cannot be confirmed, and it is possible that they were married during the time when Sweyn lived in exile at the Swedish court. After a short marriage, she died. According to Adam of Bremen it was a matter of foul play, since she was poisoned by Sweyn's concubine Thora.Adam av Bremen (1984), p. 192 (Book III, Scholion 72). It is not known if any of the many children of Sweyn were also the children of Gyda. Her assumed father Anund died in c. 1050, and was survived by Gunhild. At about the same time, Gyda's widower Sweyn married a woman also called Gunhild. She was possibly the same person as Gyda's mother or stepmother, though several modern historians maintain that there were two separate Gunhilds, a Swedish and a Danish queen, respectively.Hans Gillingstam, "Gunhild", Svenskt biografiskt lexikon A much later Chronicle of Bremen refers to a letter supposedly written by Archbishop Adalbert, which says that Gunhild was the "mother" (mother-in-law) of Sweyn.P.A. Munch (1855), Det norske Folks historie, Vol. II. Christiania: Tonsbergs, p. 189. Anyway, Sweyn and Gunhild were soon forced to separate by the Archbishop of Hamburg on account of their close kinship.Adam av Bremen (1984), p. 137 (Book III, Chapter 12).
Gyda has often been confused and mixed up with her assumed mother (or stepmother) Gunhild, as their names were similar, and because they were both married to Sweyn. Both of them were known as Gunhild, Guda or Gyda.
References
Literature Alf Henrikson (1989), Dansk historia (Danish history). Stockholm: Bonniers (Swedish)