The Heimskringla on Svein Harald Fletterson

Heimskringla > part in the government with his brother Hardaknut. In the same autumn > 4. Of Thorer Of Steig.

• attestation: Svein was a son of Harald Fietter, a Danish man of high birth, a great viking and champion

  "There was a man called Svein, a son of Harald Fietter. He was a Danish man by family, a great viking and champion, and a very clever man, and of high birth in his own country."

Heimskringla > part in the government with his brother Hardaknut. In the same autumn > 5. Of Thorer'S Adventures.

• attestation: Svein and Thorer defeated Sigurd Ulstreng at Viggia and then proceeded to Nidaros

  "Svein and Thorer also met there with their people, fought with Sigurd, and gained the victory after giving him a great defeat; and Sigurd fled, and joined King Magnus."

Heimskringla > part in the government with his brother Hardaknut. In the same autumn > 6. Death Of Thorer And Egil.

• attestation: Svein and Thorer plundered through Halogaland, but King Magnus caught up with them in a fjord called Harm.

  "Svein and Thorer proceeded northwards with their men, and plundered far and wide in Halogaland. But while they lay in a fjord called Harm, Thorer and his party saw King Magnus coming under sail towards them"

Heimskringla > part in the government with his brother Hardaknut. In the same autumn > 7. Of The Punishment Of The Throndhjem People.

• attestation: Svein Harald Flettarson fled to Denmark where he eventually won the favour of King Eystein, Magnus's son, who made him his dish-bearer.

  "Svein Harald Fletter's son, fled out to sea first, and sailed then to Denmark, and remained there; and at last came into great favour with King Eystein, the son of King Magnus, who took so great a liking to Svein that he made him his dish-bearer"