What is "bjarkarimur"

Bjarkarímur is a 15th-century Icelandic rímur cycle on the Skjöldungs (the Scyldings of Beowulf), and retells among other things the adventures of Hróarr ( Hroðgar) and his brother Helgi ( Halga), and those of Böðvarr Bjarki. It appears to be based on the lost Skjöldunga saga and is one of the extant sources of information on that work.