Tenth-century Danish queen, wife of Gorm the Old and mother of Harald Bluetooth, remembered on the Jelling runestones as Denmark's adornment; later chroniclers made her the builder of the Danevirke, but almost everything beyond the stones is legend.
Thyra was queen of Denmark in the first half of the tenth century as the wife of Gorm the Old, the first king of the Jelling line, and the mother of Harald Bluetooth. Her existence is firmly attested: Gorm raised the smaller of the Jelling stones in her memory and called her tanmarkaR bot, Denmark's adornment or salvation, and Harald's great stone at Jelling names her beside Gorm as his mother. Historians agree that Harald was her son and probably also Knud; the Historia Norwegiae adds a daughter, Gunnhild, the wife of Eric Bloodaxe, but no other source supports it.
Beyond the runestones very little about her is certain. The Historia Norwegiae, Sven Aggesen and Saxo Grammaticus, writing two centuries or more after her death, made her a wise and resolute queen who built the Danevirke, the earthwork across the neck of Jutland, to keep out the Germans. The number of stones that name her has led some historians to suggest that she held real power in her own right, perhaps even that Gorm gained the throne by marrying her.
Nothing contemporary records where Thyra came from or when she was born, and the medieval accounts contradict each other. Saxo, writing around 1200, made her the daughter of an English king, a claim that let him argue that later Danish kings had inherited a right to England. Sven Aggesen, in the 1180s, says she was of German origin and that the emperor arranged her marriage so that she could collect the tribute Gorm owed him, only for her to refuse and declare the Danes free. Icelandic saga tradition instead makes her the daughter of a ruler in Jutland. None of these stories can be checked, and each suited the politics of its author.
The only contemporary words about Thyra are carved in stone. Gorm's inscription calls her Denmark's bót, a word that can mean adornment, strength, remedy or salvation. A few scholars have argued that the phrase refers to Gorm himself and that Thyra's importance was invented by later writers, but most read it as a tribute to her. The Læborg stone, carved by the runemaster Ravnunge-Tue, was raised for Thyra as his lady, using a word that could also mean queen, which suggests that she had followers and a household of her own.
The medieval portrait is legend built on that memory. Sven Aggesen and Saxo present her as wise and steadfast, and the Historia Norwegiae contrasts her good sense with Gorm's foolishness. Saxo's Gesta Danorum tells how she refused to marry Gorm until he gave her all Denmark as her dowry, and how, when Gorm had sworn to kill whoever brought news of their son Knud's death, she found a way to let him understand without saying it. These stories show how later Danes wished to remember the mother of their royal house, not what the tenth-century queen was like.
The smaller Jelling stone, known as DR 41, reads that King Gorm made these monuments in memory of Thyra, his wife, Denmark's bót. The larger stone, set up by Harald Bluetooth around 965, says that King Harald ordered these monuments made in memory of Gorm his father and Thyra his mother, the Harald who won all Denmark and Norway and made the Danes Christian. Thyra's name also appears on stones at Læborg, Bække, Horne and Randbøl in Jutland.
It is not certain that all of these stones refer to the same woman. A study of groove depth, rune shapes and spelling has linked the Læborg stone and Harald's Jelling stone to the same carver, Ravnunge-Tue, and argued that the two Jelling stones, Læborg and the first Bække stone all commemorate her. If so, she is named on more runestones than anyone else in Viking Age Denmark, including her husband and her son.
Sven Aggesen and Saxo both credit Thyra with building the Danevirke, the line of earthworks that guarded southern Jutland. Aggesen says she tricked the German emperor into believing the rampart was meant to protect Germany from Gorm, when in fact she built it to end Denmark's tribute. Archaeology has shown that the Danevirke is far older than Thyra: timber in one early phase was felled in 737, and the defences were rebuilt and extended many times until the twelfth century. Her name may have become attached to the rampart because the Jelling kings strengthened it in the tenth century, making it the great border wall later Danes knew.
When Thyra died is unknown. Gorm's stone in her memory implies that she died first, probably in the 950s, though Saxo has her outlive him. At Jelling two great mounds stand on either side of the church; tradition calls the northern one Thyra's mound. That mound holds a timber burial chamber built from trees felled in the late 950s, but it was found empty, and many archaeologists think it was Gorm's first grave, emptied when Harald moved his father into the church he built between the mounds. No grave of Thyra has been identified.