This is the 644th most frequent Norwegian word.
historien
"The history" or "the story" (depends on context).
This usage of 'historien' refers to a narrative or tale, specifically the story concerning an old castle.
Historien om det gamle slottet er fascinerende.
The story about the old castle is fascinating.
In this case, 'historien' indicates a recount or account one shares, showing its narrative usage in communication.
Historien som han fortalte var rørende.
The story he told was touching.
Here, 'historien' is used to mean the historical events and context related to the Vikings.