Too late, Llewelyn learned what had happened while he was away. Gellert had stayed behind to guard the child and had fought and slain the wolf that had tried to destroy Llewelyn's heir.
In vain was all Llewelyn's grief; he could not bring his faithful dog to life again. So he buried him outside the castle walls within sight of the great mountain of Snowdon, where every passer-by might see his grave, and raised over it a great cairn of stones. And to this day the place is called Beth Gellert, or the Grave of Gellert.