The second king with this name was called "the Big," won the Battle of Nesjar, and was killed by the Peasant Army at the Battle of Stiklestad.
One ruler with this name married Gyda after the death of his wife Geira, and fought on a vessel called the "Long Serpent," and another king of this name was called "The Peaceful" and made a peace with William the Conqueror. One king with this name had a mother who founded the Kalmar Union and served as a regent for Eric of Pomerania, and another figure of this name fled to the Kievan Rus after a loss at the Battle of Helgea and fathered Magnus the Good. The second king with this name was called "the Big," won the Battle of Nesjar, and was killed by the Peasant Army at the Battle of Stiklestad. The first king of this name died at the Battle of Svolder after establishing the first church in his nation and defeating Earl Byrhtnoth at the Battle of Maldon in 991 A.D. For 10 points, identify this name of five kings of Norway, the second of which became Norway's patron saint.
One ruler with this name married Gyda after the death of his wife Geira, and fought on a vessel called the "Long Serpent," and another king of this name was called "The Peaceful" and made a peace with William the Conqueror.
Olaf [accept Olav]