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.
Prince Harald of Denmark Prince Harald of Denmark ("Harald Christian Frederik"; 8 October 1876 - 30 March 1949) was a member of the Danish Royal Family. He was the third son of Frederick VIII of Denmark and his wife, Lovisa of Sweden, and thus brother to Christian X of Denmark.