Question: Where did Cammán Mac Amlaíb's father die?
Sentence (from "Olaf Guthfrithson"): Olaf returned to Ireland in 938 but after Æthelstan's death the following year Olaf left for York where he was quickly able to establish himself as king, with his brother Blácaire mac Gofraid being left to rule in Dublin.
Relevant evidence: Yes