He was the only son of Hlodvir and became one of the mightiest Earls. He gain control of much of he islands and was the one who appointed his sister's husband, Gille as Earl over the Hebrides. Sigurd Digre was Orkenøy-jarl and King of Man and then Scotland. He married a daughter of the Scottish King, Malcolm.
One of the most famous traditions surrounding Sigurd was his conversion to Christianity. He was basically forced to accept Christianity by Olaf Tryggvesson who threatend to sacrifice his son Hundi, even so Olaf still took Hundi as a hostage to make sure Sigurd stayed true to Christianity. Unfortunately Hundi died and Sigurd dropped the faith.
Sigurd was killed in a battle with Sitric Silkenbeard (the Norse king of Dublin) when they attacked the Irish high king, Brian Bóru, in which Sitric promised Sigurd that he could become the High King fo Ireland if they won. Both Brian and Sigurd lost their lives in this battle, with the Irish victorious.
Sigurd er kjent som Sigurd Digre. Han var en mektig jarl og en stor hærmann. Han var Orkenøy-jarl og konge over Man og en del av Skottland. Han var gift med en datter av skottekongen Melkolm (Malcolm).