Page "Haakon III of Norway" Paragraph 3
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Håkon is first mentioned as one of the leaders of his father's armies in a battle against the Bagler in Oslo in 1197.
On his deathbed his father, who died on 9 March 1202, declared that he had no other son alive than Håkon.
When the news of Sverre's death reached Håkon and the Birkebeiner assembled in Nidaros, Håkon was first taken as chieftain by the Birkebeiner.
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