Tryggve Olafsson (Old Norse

Old Norse

Old Norse is a North Germanic language that was spoken by inhabitants of Scandinavia and inhabitants of their overseas settlements during the Viking Age, until about 1300....

: Tryggvi Óláfrsson, Norwegian

Norwegian language

Norwegian is a North Germanic language spoken primarily in Norway, where it is the official language. Together with Swedish and Danish, Norwegian forms a continuum of more or less mutually intelligible local and regional variants .These Scandinavian languages together with the Faroese language...

: Tryggve Olavsson) was king of Viken, Norway (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...

 and Ranrike

Ranrike

Ranrike was the old name for a part of Viken, corresponding to southeast Norway and the northern half of the modern Swedish province of Bohuslän...

).

Tryggve Olafsson was the son of Olaf Haraldsson

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...

, 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 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...

, and grandson of King Harald Fairhair. According to the Heimskringla

Heimskringla

Heimskringla is the best known of the Old Norse kings' sagas. It was written in Old Norse in Iceland by the poet and historian Snorri Sturluson ca. 1230...

, Tryggve performed Viking expeditions in Ireland

Ireland

Ireland is an island to the northwest of continental Europe. It is the third-largest island in Europe and the twentieth-largest island on Earth...

 and Scotland

Scotland

Scotland is a country that is part of the United Kingdom. Occupying the northern third of the island of Great Britain, it shares a border with England to the south and is bounded by the North Sea to the east, the Atlantic Ocean to the north and west, and the North Channel and Irish Sea to the...

. In 946

946

Year 946 was a common year starting on Thursday of the Julian calendar.- Religion :* May 10 – Pope Agapitus II succeeds Pope Marinus II as the 129th pope.- Deaths :...

 King Haakon I of Norway

Haakon I of Norway

Haakon I , , given the byname the Good, was the third king of Norway and the youngest son of Harald Fairhair and Thora Mosterstang.-Early life:...

 went north, and set Tryggve to defend Viken against his enemies in the south. He also gave him all that he could reconquer of land in the area which the summer before, King Haakon had subjected to payment of taxes. Historically the Danish kings had dominion over the area.

King Haakon was mortally wounded at the Battle of Fitjar

Battle of Fitjar

The Battle of Fitjar took place in Fitjar at Stord in the county of Hordaland, Norway.-Background:The Battle of Fitjar at Stord was the last battle in a war between the sons of Eric Bloodaxe and their uncle King Haakon the Good for power over Norway.It also formed part of a contest between Norway...

 in an engagement with Eirik’s sons. After Haakon's death, Harald Greycloak, third son of Eirik Bloodaxe, jointly with his brothers became kings of Norway. Tryggve was subsequently killed by Harald Greycloak as part of Harald's effort to establish his own rule over Norway. Reportedly Tryggve was lured into a trap. His wife, Astrid gave birth to their son shortly after. Tryggve's son, Olaf Tryggvason, later became king of Norway

Norway

Norway , officially the Kingdom of Norway, is a Nordic unitary constitutional monarchy whose territory comprises the western portion of the Scandinavian Peninsula, Jan Mayen, and the Arctic archipelago of Svalbard and Bouvet Island. Norway has a total area of and a population of about 4.9 million...

, and his daughter Ingeborg Tryggvasdotter

Ingeborg Tryggvasdotter

Ingeborg Tryggvasdotter was the daughter of Tryggve Olafsson, the granddaughter of Harald Fairhair, and the sister of Olaf I of Norway.She married Ragnvald Ulfsson, first the earl of Västergötland and later of Staraja Ladoga. They had two sons, Ulf and Eilif, who became earls in Kievan Rus'....

 married Ragnvald Ulfsson

Ragnvald Ulfsson

Ragnvald Ulfsson the Old was a jarl of Västergötland or Östergötland, and married to a sister of Olav Tryggvason.Ragnvald is mentioned in the skaldic poem Austrfaravísur, ascribed to Sigvatr Þórðarson, skald of King Olaf Haraldsson of Norway , who had been on a diplomatic mission to Sweden...

, the earl

Earl

An earl is a member of the nobility. The title is Anglo-Saxon, akin to the Scandinavian form jarl, and meant "chieftain", particularly a chieftain set to rule a territory in a king's stead. In Scandinavia, it became obsolete in the Middle Ages and was replaced with duke...

 of Västergötland

Västergötland

', English exonym: West Gothland, is one of the 25 traditional non-administrative provinces of Sweden , situated in the southwest of Sweden. In older English literature one may also encounter the Latinized version Westrogothia....

 and later the ruler of Staraja Ladoga.