Thyra, also known as Thorvi or Thyre, was the wife of King Gorm the Old of Denmark, the first historically recognized King of Denmark, who reigned from c. 936 to his death c. 958.
She is believed to have led an army against the Germans. Gorm and Thyra were the parents of King Harald Bluetooth.
While Gorm the Old had disparaging nicknames, his wife Thyra was referred to as a woman of great prudence. Saxo Grammaticus wrote that Thyra was mainly responsible for building the Danevirke on the southern border, but archeology has proven it to be much older, and Thyra's role was to extend it.
Thyra died before Gorm, who raised a memorial stone to Thyra at Jelling, which refers to her as the "Pride of Denmark" or the "Ornament of Denmark" (Old Danish: tanmarka but, Modern Danish: Dannebod). Gorm and Thyra were buried under one of the two great mounds at Jelling, and later moved to the first Christian church there. This was confirmed when a tomb containing their remains was excavated in 1978 under the east end of the present church.
Accounts of Thyra's parentage are late, contradictory and chronologically dubious. Saxo names her father as Ethelred, King of England (usually identified with Æthelred of Wessex), but his description of her brother as Æthelstan suggests he intended Edward the Elder, though no such daughter appears in the detailed lists of Edward's children that survive. Jómsvíkinga saga and Snorri's Heimskringla say her father was a king or jarl of Jutland or Holstein called Harald Klak.