by Susan Flantzer
© Unofficial Royalty 2025
Olaf II, King of Denmark/Olaf IV, King of Norway; Credit – Wikipedia
Olaf II, King of Denmark from 1376 to 1387, and also Olaf IV, King of Norway from 1380 to 1387, was the only child of two sovereigns, King Haakon VI of Norway and the future Queen Margrethe I of Denmark, Norway, and Sweden (Unofficial Royalty article coming). He was born in 1370 at the Akershus Fortress in Oslo, Norway. Olaf’s paternal grandparents were Magnus Eriksson, King of Norway and Sweden and Blanche of Namur. His maternal grandparents were Valdemar IV, King of Denmark and Helvig of Schleswig.
Olaf’s very capable mother Margrethe of Denmark, later Queen of Denmark, Norway, and Sweden; Credit – Wikipedia
Olaf’s maternal grandfather Valdemar IV, King of Denmark died on October 24, 1375. Valdemar IV had two sons and four daughters but all had predeceased him except his youngest daughter Margrethe, Olaf’s mother. It was expected that Duke Albert IV of Mecklenburg, the son of Valdemar IV’s eldest child (who survived childhood and had children) Ingeborg of Denmark would claim the Danish throne. However, Margrethe managed to win over the Danish royal council by offering them lucrative grants and agreements. She also won the support of the Hanseatic League, a commercial and defensive network of merchant guilds and market towns in central and northern Europe, which did not want the House of Mecklenburg to gain power in Denmark. On May 3, 1376, five-year-old Olaf was proclaimed King of Denmark with his mother Margrethe acting as Regent of Denmark because of her son’s young age from May 3, 1376, until his early death on August 3, 1387.
A little more than four years later, on September 11, 1380, Olaf’s father King Haakon VI of Norway died. Ten-year-old Olaf was now also King of Norway, and his mother Margrethe was also Regent of Norway. With Olaf’s accession to the throne of Norway, 434 years of a Danish-Norwegian union began. After Olaf, no King of Norway would be born on Norwegian soil for 567 years, until King Harald V, born in 1937, became King of Norway in 1991.
Remains of the tombstone of King Olaf II at Sorø Abbey; Credit – Von Orf3us – Eigenes Werk, CC BY 3.0, https://commons.wikimedia.org/w/index.php?curid=16134679
On August 3, 1387, at Falsterbohus in Falsterbo, Sweden, Olaf II, King of Denmark/Olaf IV, King of Norway died, aged sixteen years old. He was buried at Sorø Abbey, a Benedictine Abbey on the island of Zealand in Denmark. There were unproven rumors that Olaf was poisoned. In 2015, Jørgen Lange Thomsen, a forensic scientist, proposed a theory Olaf II died from Brugada Syndrome, a genetic disorder. See Copenhagen Post: Mystery of Danish king deaths fosters new theory.
After her son’s death, Margrethe, who had been a very capable Regent of Denmark and Norway, reigned as Queen Margrethe I of Denmark, Norway, and Sweden for twenty-five years. She was the founder of the Kalmar Union in which Denmark, Sweden, and Norway were ruled together under one monarch from 1397 until 1523 when Sweden seceded and became its own kingdom.
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Works Cited
- Bidragsytere til Wikimedia-prosjektene. (2005). Konge av Danmark og Norge. Wikipedia.org; Wikimedia Foundation, Inc. https://no.wikipedia.org/wiki/Olav_H%C3%A5konsson
- Margaret I of Denmark. (2023). Wikipedia. https://en.wikipedia.org/wiki/Margaret_I_of_Denmark
- Wikipedia Contributors. (2024). Olaf II of Denmark. Wikipedia; Wikimedia Foundation. https://en.wikipedia.org/wiki/Olaf_II_of_Denmark