Question: Who was the father of the Danish king involved in the Battle of Marton?
Sentence (from "Halfdan Ragnarsson"): According to the tradition recorded in the Norse sagas he was one of the sons of Ragnar Lodbrok, and his brothers included Björn Ironside, Ivar the Boneless, Sigurd Snake-in-the-Eye and Ubba.
Relevant evidence: Yes