She united Denmark, Sweden and Norway and formed the Kalmar Union.

Struggling to unite Denmark, Harald Buetooth builds at least four large circular forts around this time.

When Harald died, Gorm took his kingdom too and united Denmark.

In the early 11th century Canute the Great won and united Denmark, England and Norway for almost 30 years.

Its foundation coincided with the political aspirations of the Scandinavian movement, which sought to unite Sweden, Norway and Denmark into a single kingdom.

And Harald records in the runes that he himself united Denmark, and conquered Norway, and "made the Danes Christian."

The year contains the story of two ambitious future kings in Scandinavia who both may have hoped to unite Sweden, Denmark, and Norway under their throne.

The Kalmar Union is established in 1397, uniting Norway, Sweden and Denmark into one kingdom.

King Harald Bluetooth united Denmark.

Negotiated by the Danish regent Margrethe, the Union of Kalmar (1397) united Denmark, Norway and Sweden under one crown.