The Saga of the Jomsvikings relates that the Jomsvikings were highly selective in deciding whom to admit to their order. Membership was restricted to men of proven valor between 18 and 50 (with the exception of a boy named Vagn Åkesson, who defeated Sigvaldi Strut-Haraldsson in single combat at the age of 12).
In 1019, Yaroslav married Ingegerd Olofsdotter, daughter of Olof Skötkonung, the king of Sweden.   He gave Staraya Ladoga to her as a marriage gift. Saint Sophia's Cathedral in Kiev houses a fresco representing the whole family: Yaroslav, Irene (as Ingegerd was known in Rus'), their four daughters and six sons. 
Eric the Victorious (Old Norse: Eiríkr inn sigrsæli, Modern Swedish: Erik Segersäll; c. 945 – c. 995) was a Swedish monarch as of around 970.Although there were earlier Swedish kings, he is the first Swedish king in a consecutive regnal succession, who is attested in sources independent of each other, and consequently Sweden's list of rulers usually begins with him.
Leif Erikson, Leiv Eiriksson, or Leif Ericson, also known as Leif the Lucky (c. 970 – c. 1019 to 1025), was a Norse explorer who is thought to have been the first European to have set foot on continental North America, approximately half a millennium before Christopher Columbus.
Though the sagas agree that Olaf Tryggvason had only 11 ships in the battle, some of them quote a verse by Halldórr the Unchristian saying that Olaf had 71 ships when he sailed from the south. The sagas explain the discrepancy by saying that some of the 71 ships belonged to Jarl Sigvaldi, who deserted Olaf, and that others sailed past the trap at Svolder before it was sprung.
The earliest record of what is generally considered to be a Swedish king appears in Tacitus' work Germania, c. 100 AD (the king of the Suiones).However, due to scant and unreliable sources before the 11th century, lists of succession traditionally start in the 10th century with king Olof Skötkonung, and his father Eric the Victorious, who also were the first Swedish kings to be baptized.
24/02/2015 · Two years later Olaf returned to Norway to reclaim his throne and Harald took 600 men with him to help his half-brother. 15 year old Harald fought alongside Olaf against people loyal to Cnut the Great in the Battle of Stiklestad in July 1030. The brothers were defeated. Olaf died in battle and Harald was seriously wounded and had to flee.