You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "What was the name of Gudrød Bjørnsson's grandfather, who is also known as the first King of Norway?" whose answer is Harald Fairhair.
Each document should contain about 30 words, and these documents should contain useful information.

Query: name of Gudrød Bjørnsson's grandfather, first King of Norway
Useful Output:

Doc 1: Gudrod Bjørnsson was son of Bjørn the Merchant Haraldsson. [1] After his father's death Gudrod was fostered by his uncle, Bjorn the Merchant's brother Olaf.
Doc 2: Eirik was banished from Norway 935 and went to the Orkneys where some sources indicates he became king of the Isles and Man. The Norse sagas
Doc 3: Gudrød Bjørnsson was the son of Bjørn Farmann, the king of Vestfold, and consequently a grandson of Harald Fairhair. Gudrød was the father of
Doc 4: Magnus 'Barefoot' is the first aggressive king of Norway since the reign of his grandfather, Harald Hardrade. Having secured his throne at home in these
Doc 5: Gudrød was a grandson of Harald Fairhair and the king of Vestfold. Harald's cognomen Grenske is due to his being raised in the district of