Gizur was the foster-father of Heidrek, who made a coup-d'état in Reidgotaland, the land of the Goths (see Oium and the Chernyakhov culture).
Following the death of Heidrek by the hand of his slaves, his son Angantyr, who was the new king of the Goths, avenged him and held a great banquet in his memory.
The aged Gizur, Heidrek's foster father, was among the kings who arrived at the Goth capital Arheimar on the Dniepr (Danpar) and participated in the banquet.
[5] After Angantyr heard of the defeat, Gizur rode out as a herald to the Huns, and when he saw them at a distance he called out and summoned them to another battle "on the Danube heath below the Hills of Ash".
Since he helped the Goths, Hlöd mockingly called the king the Grýtingaliði, an Ostrogoth (Greutungi) warrior and "Angantyr's man":