How was Fridlevus II related to Halfdan?
Halfdan Halfdan (Old Norse: "Halfdan" , Old English: "Healfdene" , Medieval , Proto-Norse: "*Halbadaniz", "half Dane") was a late 5th and early 6th century legendary Danish king of the Scylding (Skjöldung) lineage, the son of king named Fróði in many accounts, noted mainly as the father to the two kings who succeeded him in the rule of Denmark, kings named Hroðgar and Halga in the Old English poem "Beowulf" and named Hróar and Helgi in Old Norse accounts.
Thorolf Kveldulfsson Thorolf Kveldulfsson (modern Icelandic: Þórólfur Kveld-Úlfsson) was the oldest son of Kveldulf Bjalfasson and brother of the Norwegian/Icelandic goði and skald Skalla-Grimr. His ancestor (great uncle) Hallbjorn was nicknamed "halftroll", possibly indicating Norwegian-Sami ancestry.