Gyrd and Gnupa were kings of Denmark

Denmark

Denmark is a Scandinavian country in Northern Europe. The countries of Denmark and Greenland, as well as the Faroe Islands, constitute the Kingdom of Denmark . It is the southernmost of the Nordic countries, southwest of Sweden and south of Norway, and bordered to the south by Germany. Denmark...

 in the 10th century according to Sweyn II of Denmark

Sweyn II of Denmark

Sweyn II Estridsson Ulfsson was the King of Denmark from 1047 to 1074. He was the son of Ulf Jarl and Estrid Svendsdatter. He was married three times, and fathered 20 children or more, including the five future kings Harald III Hen, Canute IV the Saint, Oluf I Hunger, Eric I Evergood and Niels...

 and Adam of Bremen

Adam of Bremen

Adam of Bremen was a German medieval chronicler. He lived and worked in the second half of the eleventh century. He is most famous for his chronicle Gesta Hammaburgensis Ecclesiae Pontificum .-Background:Little is known of his life other than hints from his own chronicles...

. They were the sons of the Swedish chieftain Olof (or Olaf) the Brash

Olof the Brash

Olaf, according to the Danish king Sweyn Estridson and Adam of Bremen, was a Swedish chieftain who conquered Denmark in the late 9th century or early 10th century and founded the House of Olaf....

 who had conquered Denmark and they ruled together according to Swedish tradition.

Gnupa is mentioned on the two Sigtrygg Runestones

Sigtrygg Runestones

The two Sigtrygg Runestones, designated as DR 2 and DR 4 in the Rundata catalog, are two of the Hedeby stones that were found in Schleswig-Holstein, Germany, which during the Viking Age was part of Denmark. The runestones were raised after the Danish king Sigtrygg Gnupasson by his mother Ásfriðr...

 raised near Schleswig by his wife Asfrid for their son Sigtrygg. Likewise a Danish king Chnuba is named by Widukind of Corvey

Widukind of Corvey

Widukind of Corvey was a Saxon historical chronicler, named after the Saxon duke and national hero Widukind who had battled Charlemagne. Widukind the chronicler was born in 925 and died after 973 at the Benedictine abbey of Corvey in East Westphalia...

's Saxon chronicles as having been defeated and forced to accept baptism in 934, and Olav Tryggvasson's Saga

Heimskringla

Heimskringla is the best known of the Old Norse kings' sagas. It was written in Old Norse in Iceland by the poet and historian Snorri Sturluson ca. 1230...

 tells of Gnupa's defeat by Gorm the Old

Gorm the Old

Gorm the Old , also called Gorm the Sleepy , was the first historically recognized King of Denmark, reigning from to his death . He ruled from Jelling, and made the oldest of the Jelling Stones in honour of his wife Thyra. Gorm was born before 900 and died .-Ancestry and reign:Gorm is the reported...

. However, this chronology would contradict that of Adam of Bremen, who places the succession and subsequent defeat of Sigtrygg during the tenure of Archbishop Hoger of Bremen (909-915/7). The late and legend-influenced Gesta Danorum

Gesta Danorum

Gesta Danorum is a patriotic work of Danish history, by the 12th century author Saxo Grammaticus . It is the most ambitious literary undertaking of medieval Denmark and is an essential source for the nation's early history...

 of Saxo Grammaticus

Saxo Grammaticus

Saxo Grammaticus also known as Saxo cognomine Longus was a Danish historian, thought to have been a secular clerk or secretary to Absalon, Archbishop of Lund, foremost advisor to Valdemar I of Denmark. He is the author of the first full history of Denmark.- Life :The Jutland Chronicle gives...

 names a nobleman Ennignup serving as guardian for a young king Knut at some time prior to king Gorm the Old

Gorm the Old

Gorm the Old , also called Gorm the Sleepy , was the first historically recognized King of Denmark, reigning from to his death . He ruled from Jelling, and made the oldest of the Jelling Stones in honour of his wife Thyra. Gorm was born before 900 and died .-Ancestry and reign:Gorm is the reported...

and it has been suggested he may be a confused representation of Gnupa.