How was Fridlevus II related to Halfdan?
Fridlevus II Fridleif (Ynglinga saga) was a son of Fróði of the Skjöldung (Scylding) lineage. In that work he was the brother of Halfdan and the father of Áli the Strong.
Freawine Freawine, "Frowin" or "Frowinus" figures as a governor of Schleswig in "Gesta Danorum" and in the "Anglo-Saxon Chronicle" as an ancestor of the kings of Wessex, but the latter source only tells that he was the son of Frithugar and the father of Wig.