Heimskringla, Fagrskinna, Ágrip and Historia Norwegiæ all relate that Halfdan drowned when he fell through the ice at the inlet Røykenvik in the lake Randsfjorden on his return home from Hadeland.
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In Vingulmark, 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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Halfdan the Black (John Cleese) joins them, afraid that peace will mean the end of his reign, and sets sail in pursuit.