The 10th century in Denmark saw the emergence of the country into historical records and the conversion of the country to Christianity. The 950s are when the first records of the state of Denmark (Tan-marker) appeared.
910s
940s
- 942 – William I, Duke of Normandy offers asylum to Harald, and restores him to his throne by force. William I is assassinated later that year.[4] However, the "Haigrold" described by the chronicler was possibly King Harald Greycloak of Norway or different Viking.[5]
- 947 – The Norwegian Eric Bloodaxe is elected King of York. He is deposed when the English king Eadred marches north, and flees to Denmark.[6]
- 949 – Eric Bloodaxe returns from Denmark to England. He will be killed in battle in 952.[6]
950s
- 950 – Gorm the Old conquers most of Denmark.[7]
- 950 – Denmark under Gorm's son Harald Bluetooth conquers Norway.[8]
- 958 – Gorm the Old dies[9] and Harald Bluetooth becomes sole king, succeeding his father.[10]
960s
970s
- 975 – Harald Bluetooth tries to force Christianity upon Haakon Sigurdsson, who then turns against him.
980s
- 980s – Viking raids against England resume during the minority of Æthelred the Unready.
- 980 – Struggling to unite Denmark, Harald Bluetooth builds at least four large circular forts around this time.
- 980 – Harald Bluetooth builds the first church in Zealand at Roskilde.
- 984 – The ladies of Denmark give their gold and silver ornaments to the Jutlanders in exchange for the release of Sweyn Forkbeard.[16]
- 988 – First known mention of Odense in writing.[17]
- 988 – Sweyn seizes power from his father, Harald Bluetooth.
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