Sigurd Håkonsson Ladejarl was the son of Håkon Grjotgardsson, the first Jarl of Lade (Old Norse Hlaðir). Upon reaching maturity, Sigurd inherited his father"s position. Sigurd Håkonsson was married to Bergljot Toresdatter, daughter of Tore Teiande Ragnvaldsson (Thorir Rögnvaldarson) and Ålov Årbot Haraldsdatter.
In 900, Håkon came into conflict with Atle Mjove over Sogn and fought a battle at Fjaler (Old Norse: Fjalir), in which Håkon was killed. In 892, Tore Ragnvaldsson became Jarl of Møre after the death of his father, Ragnvald Eysteinsson. In autumn 962, Sigurd Håkonsson and his party were burnt to death by Harald Greycloak, while staying the night at a party at Aglo, in modern day Skatval in the municipality of Stjørdal.
Sigurd was killed as part of Harald"s effort to reunite all of Norway under his rule.
Sigurd had Kormákr Ögmundarson as a court poet. Fragments of Kormákr"s lay on Sigurd Håkonsson, Sigurðardrápa, are preserved in Skáldskaparmál and in Heimskringla.
