Harald Grenske of Westfold Viceroy ¹⁵⁰⁷

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Harald Grenske (10th century) was a petty king in Vestfold in Norway.

Harald Grenske was the son of Gudrød Bjørnsson. Gudrød was a grandson of Harald Fairhair and the king of Vestfold. Harald's cognomen Grenske is due to his being raised in the district of Grenland, Norway. When Harald was only 11 years old, his father was slain by the sons of Gunnhild Gormsdóttir (i.e. Harald Greyhide and his brothers). Harald fled to Oppland and from there to Sweden, where he stayed with the powerful strongman Skagul Toste. They went on Viking expeditions together, principally within areas of the Baltic Sea.

When the sons of Gunnhild had been banished, Harald Grenske followed Haakon Sigurdsson who ruled Norway as a vassal of the Danish king Harald Bluetooth. Harald became the king of Vestfold and Agder. He married Åsta, the daughter of Gudbrand Kula.

Harald subsequently abandoned Åsta to woo Sigrid the Haughty, the daughter of Skagul Toste. She was the wealthy widow of Eric the Victorious and owned several farms in Svithjod. Sigrid found him too eager with his entreaties. She had him burnt to death inside a great hall following a feast to discourage other suitors. Harald died together with another suitor, Vissevald (Wsevolod) from Gardarike (Novgorod).

His widow, Åsta, promptly gave birth to a son, Olaf the Stout, future king of Norway and patron saint of the nation. Åsta subsequently remarried to Sigurd Syr, the king of Ringerike.

No contemporary sources said anything about Harold, and the sagas only mention him in connection with St. Olaf's history. According to Snorri Sturluson in Olav Trygvasons saga, he was a king of Vingulmark, Vestfold and Agder. Recent scholarship has questioned the historicity of Harald.

Harald blev gift med Åsta Gudbrandsdatter, datter af Gudbrand Kula og Ulfhild. (Åsta Gudbrandsdatter blev født omkring 975 og døde mellem 1020 og 1030.)

Harald blev derefter gift med Sigrid Storrade, datter af Skogul Toste og N.N.