Haakon VI in the context of "Margaret I of Denmark"

Margaret I (Danish: Margrete Valdemarsdatter; March 1353 – 28 October 1412) was Queen regnant of Denmark, Norway, and Sweden (which included Finland) from the late 1380s until her death, and the founder of the Kalmar Union that joined the Scandinavian kingdoms together for over a century. She had been queen consort of Norway from 1363 to 1380 and of Sweden from 1363 to 1364 by marriage to Haakon VI. Margaret was known as a wise, energetic and capable leader, who governed with "farsighted tact and caution", earning the nickname "Semiramis of the North". Also known famously and derisively as "King Breechless", one of several derogatory nicknames once thought to have been invented by her rival Albert, King of Sweden, she was also called "Lady King" by her subjects, widely used in recognition of her capabilities. Knut Gjerset calls her "the first great ruling queen in European history".

The youngest daughter of Valdemar IV of Denmark, Margaret was born at Søborg Castle. She was a practical, patient administrator and diplomat, albeit one of high aspirations and a strong will, who intended to unite Scandinavia forever into one single entity with the strength to resist and compete against the might of the Hanseatic League. In 1363, aged ten, Margaret married Haakon VI. In 1370, they had a son, Olaf. Following the deaths of her husband and son, Margaret was proclaimed queen of the Scandinavian kingdoms. She was ultimately succeeded by a grandnephew, Erik of Pomerania. Although Erik came of age in 1401, Margaret continued for the remaining 11 years of her life to be sole ruler in all but name. Her regency marked the beginning of a Dano-Norwegian union which was to last for more than four centuries.