Kylfings
They are mentioned in Old Norse runestone inscriptions , sagas ( most notably in "Egil's Saga" ) , and poetry ( such as Thorbjorn Hornklofi's poem "Haraldskvæði" ) , as well as Byzantine records and Rus' law-codes . 
<triplet> Haraldskvæði <subj> Thorbjorn Hornklofi <obj> author