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.
Inge the Younger Inge the Younger was King of Sweden in c. 1110–c. 1125 and the son of king Halsten and he was probably Halsten's youngest son. According to unreliable traditions Inge would have ruled together with his brother Philip Halstensson after the death of their uncle Inge the Elder: In English literature both have also been called "Ingold".