Akershus Fortress: A crucial military site in Norway, built-in 1299


In Oslo, Norway, a fortress called the Akershus Fortress was built in 1299 to defend Oslo.

It is still used as a Norwegian military facility today and is an essential spot in Norway’s history and military affairs.

In this article, I would like to introduce in detail the background of the birth of Akershus Fortress, the places to visit for sightseeing, and the fact that it was a model for a famous animated film.

Overview of Akershus Fortress

Akershus Fortress is a medieval fortress built on a hill overlooking Piper Bay in Oslo, the capital of Norway.

Akershus Fortress was built in Oslo in 1299.

It was built by King Haakon V of Norway to defend the capital Oslo, the administrative and economic center of Norway, against the invasion of Sweden and other foreign enemies.

And did you know that Akershus Fortress continues to be used as a Norwegian military facility in the 21st century?

The eastern side of Akershus Fortress houses the Norwegian Ministry of Defense and the headquarters of the Norwegian Defense Forces, which continue to protect Norway more than 700 years after its construction.

Built for the defense of Oslo

As mentioned earlier, Akershus Fortress was initially intended as a fortress to defend the capital city of Oslo.

Akershus Fortress was built in 1299 under the command of King Haakon V of Norway.

The background to this was the attack on Oslo in 1287 by Alf Erdlingsson, a Norwegian nobleman at the time.

This incident revealed the vulnerability of Oslo’s defenses, and plans for constructing the Akershus Fortress were hastily drawn up.

As the capital of Norway, Oslo was also an important center for the Norwegian economy and military in the 13th century.

In particular, Norway’s primary industry, the maritime and shipping trade, was a pillar of the Norwegian economy, as it was during the Middle Ages as well.

Therefore, a substantial fortification was necessary to defend the coastline, a key trade route.

Renovated into a modern palace in the 17th century

In the 17th century, it was remodeled into a modern castle in the Renaissance style by King Christian IV of Denmark.

The name of the King of Denmark is mentioned here because Norway, together with Denmark and Sweden, had formed the “Kalmar Union” in 1397 under the leadership of Queen Margaret I of Denmark.

After Sweden withdrew from the Kalmar Union in 1523, the Danish-Norwegian confederation remained intact.

The Kalmar Union’s breakdown led to a war between Sweden and the United Kingdom of Denmark and Norway.

In other words, Akershus Fortress needed further strengthened to prevent a Swedish invasion, so King Christian IV of Denmark rebuilt the castle.

The renovations removed the traditional fortifications and added more modern fortifications to accommodate the weapons of the time, such as firearms.

The Kalmar Union is described in more detail in this article.

Kalmar Union: Union of monarchs concluded by three Nordic countries in 1397The Kalmar Union is a historic alliance signed in 1397 by the three Nordic countries of Denmark, Sweden, and Norway.Kalmar Union was signed at Kalmar Castle in Sweden and would unite the Nordic countries for the next several hundred years.In this article, I would like to introduce the background and objectives that led the Nordic countries to form the Kalmar Union and how the alliance ultimately came to be....

In the past, the Nazis took over

Akershus Fortress was built at the end of the 13th century and has been the site of many battles since then.

Akershus Fortress had been a defender of Norway for hundreds of years until the Second World War, when the Nazis finally took it over.

After the Nazi German invasion of Scandinavia, the Norwegian government abandoned the capital city of Oslo in 1940, and Akershus Fortress was also placed under Nazi control at that time.

During the war, the castle was used by the Nazis as an execution site for resistance fighters and prisoners of war in Norway.

Furthermore, after the war ended, there was a purge of war criminals in Norway who had sided with the Nazis.

Akershus Fortress as a tourist attraction

Much blood was shed at Akershus Fortress during the war.

Today, however, there is no dark shadow of war.

With its beautiful stone walls and green lawns, it has become a place of relaxation for Norwegian citizens.

Akershus Fortress is located on a hill. From its ramparts, visitors can enjoy a panoramic view of the historic city of Oslo and the magnificent sea where ships pass by.

Except for official events, the castle is usually open to the public, and visitors can tour the interior, which retains the appearance of its medieval past.

For example, there is a large hall where banquets are held, a chapel for royal funerals, and a royal mausoleum where former Norwegian royalty are buried.

The royal mausoleum is where Norway’s royal family, Haakon VII and his queen Maud and Olav V and his queen Märtha, are buried.

The castle also exhibits many medieval furnishings associated with King Christian IV, making it an excellent place to learn about Norwegian history.

On the other hand, there is also a dungeon in the castle that reminds us that it was a military fortress. Visitors can learn about the history of Akershus Fortress from a different angle than its elegant interior.

Model for Arendelle Castle in “Frozen”

Incidentally, Akershus Fortress is famous as the model for Arendelle Castle in the 2013 Disney film Frozen.

Arendelle Castle appeared many times in the film as the castle where the main characters, Anna and Elsa, lived.

Many people may have wondered why Akershus Fortress looked so familiar when they saw it.

It is the model for Arendelle Castle in Frozen, and since the movie was released, many Disney fans have come to visit.


Akershus Fortress has played an important role in Norway’s military affairs from its birth in 1299 until now, more than seven centuries later.

As the setting of Norwegian history and warfare and as the model for Arendelle Castle in “Frozen,” it has become a landmark with many facets.