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| | biology - Halfdan the Black |
 | | He divided the kingdom of Vestfold with his brother Olaf and, through military action, persuaded King Gandalf of Vingulmark to cede half his kingdom. |
 | | To secure his claim to Raumarike, Halfdan first defeated and killed Sigtryg, the previous ruler, in battle, then defeated Sigtryg's brother and successor Eystein in a series of battles. |
 | | The sons of Gandalf of Vingulmark, Hysing, Helsing, and Hake, attempted to ambush Halfdan at night but he escaped into the forest. |
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