What is the name of Elsa and Anna's grandfather in Frozen II?

Elsa and Anna’s grandfather in Frozen II is King Runeard.

Runeard was the former king of Arendelle and the father of King Agnarr, Elsa and Anna’s father. In the prologue, Agnarr tells his daughters about Runeard’s dealings with the Northuldra, an indigenous people living in the Enchanted Forest. Runeard presented a dam as a gesture of friendship, but the film later reveals that he intended to weaken the Northuldra.

Frozen II overturns the image of Runeard as a benevolent ruler. His fear of the Northuldra’s connection to magic led him to provoke conflict and murder their leader. That act triggered the spirits’ anger, trapped Arendellian soldiers and Northuldra in the forest, and created the historical injustice Elsa and Anna must resolve.

King Agnarr is the most tempting mix-up because he is Elsa and Anna’s father, not their grandfather. King Hans is Anna’s former suitor from the first film, while King Leif is not the family member identified in Frozen II. Runeard’s role links the sisters’ family history directly to the film’s central conflict over truth, responsibility, and reconciliation.