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.
Brestir Sigmundsson Brestir Sigmundsson (10th century, Skúvoy, Faroes - 970 Dímun, Faroes) was together with his brother Beinir Sigmundsson ruler over half of the Faroe Islands.