Gudrød Bjørnsson was the son of Bjørn Farmann

Bjørn Farmann

Bjørn Farmann was the king of Vestfold. Bjørn was one of the sons of Harald Fairhair, the first king of Norway...

, the king of Vestfold

Vestfold

is a county in Norway, bordering Buskerud and Telemark. The county administration is in Tønsberg.Vestfold is located west of the Oslofjord, as the name indicates. It includes many smaller, but well-known towns in Norway, such as Larvik, Sandefjord, Tønsberg and Horten. The river Numedalslågen runs...

, and a grandson of Harald Fairhair. Gudrød was the father of Harald Grenske

Harald Grenske

Harald Grenske was the petty king in Vestfold in Norway.Harald Grenske was the son of Gudrød Bjørnsson. 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 Grenland, Norway. When Harald was only 11 years old,...

, and the paternal grandfather of Saint Olaf.

After Gudrød's father had been killed by Eric Bloodaxe

Eric Bloodaxe

Eric Haraldsson , nicknamed ‘Bloodaxe’ , was a 10th-century Scandinavian ruler. He is thought to have had short-lived terms as the second king of Norway and possibly as the last independent ruler of the kingdom of Northumbria Eric Haraldsson (Eric, anglicised form of ; died 954), nicknamed...

, he lived with his uncle Olaf Haraldsson Geirstadalf

Olaf Haraldsson Geirstadalf

Olaf Haraldsson , was a reputed son of King Harald Fairhair of Norway with Svanhild Øysteinsdotter, daughter of Øystein Jarl.The saga Heimskringla, written in Iceland in the thirteenth century by the poet and historian Snorri Sturluson, gives the ninth century Norwegian founder king Harald Fairhair...

, the king of Vingulmark

Vingulmark

Vingulmark is the old name for the area in Norway which today makes up the counties of Østfold, western parts of Akershus , and eastern parts of Buskerud , and includes the site of Norway's capital, Oslo...

. Olaf rebelled against Bloodaxe, but was killed in battle, and so Gudrød had to escape to Oppland

Oppland

is a county in Norway, bordering Sør-Trøndelag, Møre og Romsdal, Sogn og Fjordane, Buskerud, Akershus, Oslo and Hedmark. The county administration is in Lillehammer. Oppland is, together with Hedmark, one of the only two landlocked counties of Norway....

.

When Haakon the Good had become king, Gudrød was given Vestfold, his father's kingdom, as a fief.

Gudrød was slain in the vicinity of Tønsberg

Tønsberg

is a city and municipality in Vestfold county, southern Norway, located around north-east of Sandefjord. The administrative centre of the municipality is the city of Tønsberg....

, by Harald Greyhide, who feared a rebellion from his subordinate kings.

Source

(http://runeberg.org/nfbj/0297.html, http://runeberg.org/nfbj/0298.html)