Question: The Danish House of Knýtlinga was lived in by Cnut the Great and his grandfather that had what last name?
Sentence (from "Harald Bluetooth"): Harald "Bluetooth" Gormsson (Old Norse: "Haraldr Gormsson" , Danish: "Harald Blåtand Gormsen" , died c. 985/86) was a king of Denmark and Norway.
Relevant evidence: Yes