Vingulmark

Vingulmark (Old Norse Vingulmǫrk) is the old name for the area in Norway which today makes up the counties of Østfold, western parts of Akershus (excluding Romerike), and eastern parts of Buskerud (Hurum and Røyken municipalities), and includes the site of Norway's capital, Oslo.

During the Middle Ages, Vingulmark was an administrative unit limited to Oslo, Bærum and Asker.

[1] The Lexicon Poeticon and Völsa Þattr tells that 'vingull' is the name for a stallions genitalia [1] According to medieval kings' sagas, it was a Viking Age petty kingdom.

Snorri Sturluson writes in Heimskringla and Fagrskinna, that King Harald Fairhair inherited part of Vingulmark from his father Halfdan the Black.

Snorri Sturluson relates in Heimskringla that the area was also claimed by the Swedish King Erik Emundsson.