It is called the Queens Mountain, Drottningberget in Swedish, and it is an ancient fortress. More accurate a hill-fort. The natural form of the rock is what create the attributes of a fortress. There is very little man made constructions made. The height and the flat plateau on the top together with the availability of water made it perfect to stand ground. I have no idea where the royal name come from but maybe there was a female ruler in the settlement.
44 meter up surrounded by steep cliffs it was an easy place to defend by simply throwing stones in the head of the attacking enemy. I wonder if this is why the soldiers helmet was invented, still used today. There is only two ways up without any climbing gear, trust me I’ve tried. Here you can see some remains of walls and collected throw size stones. With the sea level a few meters higher up it was most likely attackers came from the sea.
Keep it simple, ha de Gött!