olaf's favorite son kjartan traveled abroad with his beloved cousin bolli þorleiksson. the two were very close. ultimately, however, they grew apart when bolli married kjartan's lover guðrún ósvífrsdóttir. according to oddr snorrason, olaf had predicted that strife would ensue between kjartan and bolli. tensions between the cousins grew until a full-blown blood feud ended with kjartan being killed by bolli in 1003. ironically, bolli killed kjartan with the sword "leg-biter," which had been given to him as a gift by his cousin thurid, kjartan's sister. olaf refused to prosecute bolli for the killing, and arranged for him to pay a fine instead; by sharp contrast, he had gudrun's brothers, who had goaded bolli to fight his cousin, driven into exile.