King Magnus VII rules Norway until 1350, when his son, Haakon, is placed on the throne as Haakon VI.

In 1363, Haakon VI marries Margaret, the daughter of King Valdemar IV of Denmark.

Upon the death of Haakon VI, in 1379, his son, Olaf IV, is only ten years old.

Olaf had already been elected to the throne of Denmark, as Olaf II, on May 3, 1376.

Thus, upon Olaf's accession to the throne of Norway, Denmark and Norway enter personal union.

Olaf's mother and Haakon's widow, Queen Margaret, manages the foreign affairs of Denmark and Norway during the minority of Olaf.