Upon his return, he shared the throne for two years with his nephew Magnus the Good.  
This king was given the title manglavites while serving in the Varangian Guard of Michael IV, and on his way back to his home country he married Elizabeth, the daughter of Yaroslav the Wise of Kiev. His self-imposed exile was brought on by his loss at the battle of Stiklestad, which saw the death of his half-brother St. Olaf.  Upon his return, he shared the throne for two years with his nephew Magnus the Good.  Having failed to wrest Denmark from Svein Estridsen, he turned his attention to England, where he earned the fealty of Tostig, alongside whom he would soon die.  For 10 points, name this Norwegian king killed by the army of Harold Godwinson at Stamford Bridge.
This king was given the title manglavites while serving in the Varangian Guard of Michael IV, and on his way back to his home country he married Elizabeth, the daughter of Yaroslav the Wise of Kiev.
{Harald III} Sigurdsson or {Harald Hardraade} or {Harold the Ruthless}