871 -  The commercial town of Tunsberg existed.
It served as a stronghold for the Ynglings, who first came to power in Vestfold in this period.

11th century  - The commercial town and fortress at Tunsberg, on the Oslofjord outdistanced Skiringssal as a trading center.

1201 -   Sverre Sigurdsson, king of Norway from 1177–1202, was attacked in Oslo by combined forces from the Oppland, Viken, Telemark and Tunsberg.
Although they outnumbered Sverre's forces, they were defeated by Sverre's superior tactics.
One of their ablest leaders, Reidar Sendemann, took refuge in the heights of Tunsberg mountain.
In September 1201, Sverre lay siege with a force of 1000 men, forcing their surrender after 5 months.
Unfortunately for Sverre, he took ill in the siege and returned to Bergen only to die later in 1202.

1253 - Haakon Haakonsson, king 1217-1263, constructed a castellated wall around the mountain and provided support buildings within the fortification.

1253 -  Successfully resisted attack by Danish forces.

1261 - Magnus Lagabøter, king of Norway 1263-1280, brought his bride Ingeborg of Denmark to live in the castle.

1319 - Haakon V Magnusson, king 1299-1319, the last of the Harald-lineage (Haralds-ætten) lay ill and died at Tønsberghus.

1335 - Magnus Eriksson, king from 1319–1374, was wedded here to Blanche of Namur, who received the castle as a gift from her husband.

1387 - When the castles were no longer occupied by Norwegian royalty, the most important lords were the governors of the four chief Norwegian fortresses, Tønsberghus, Akershus, Båhus, and Bergenhus.

1503 - As the Kalmar Union collapsed, Norwegian attempts to rebel were suppressed by Danish forces.
Tunsberghus fortress was destroyed by Swedish soldiers and disloyal local peasants.

1856 - Tønsberg Maritime Club built a wooden watchtower which burnt down in 1874.

1888 - Tunsberg Slottsfjellet, the present tower was built.
871 -  The commercial town of Tunsberg existed. It served as a stronghold for the Ynglings, who first came to power in Vestfold in this period.
11th century  - The commercial town and fortress at Tunsberg, on the Oslofjord outdistanced Skiringssal as a trading center.
1201 -   Sverre Sigurdsson, king of Norway from 1177–1202, was attacked in Oslo by combined forces from the Oppland, Viken, Telemark and Tunsberg. Although they outnumbered Sverre's forces, they were defeated by Sverre's superior tactics. One of their ablest leaders, Reidar Sendemann, took refuge in the heights of Tunsberg mountain. In September 1201, Sverre lay siege with a force of 1000 men, forcing their surrender after 5 months. Unfortunately for Sverre, he took ill in the siege and returned to Bergen only to die later in 1202.
1253 - Haakon Haakonsson, king 1217-1263, constructed a castellated wall around the mountain and provided support buildings within the fortification.
1253 -  Successfully resisted attack by Danish forces.
1261 - Magnus Lagabøter, king of Norway 1263-1280, brought his bride Ingeborg of Denmark to live in the castle.
1319 - Haakon V Magnusson, king 1299-1319, the last of the Harald-lineage (Haralds-ætten) lay ill and died at Tønsberghus.
1335 - Magnus Eriksson, king from 1319–1374, was wedded here to Blanche of Namur, who received the castle as a gift from her husband.
1387 - When the castles were no longer occupied by Norwegian royalty, the most important lords were the governors of the four chief Norwegian fortresses, Tønsberghus, Akershus, Båhus, and Bergenhus.
1503 - As the Kalmar Union collapsed, Norwegian attempts to rebel were suppressed by Danish forces. Tunsberghus fortress was destroyed by Swedish soldiers and disloyal local peasants.
1856 - Tønsberg Maritime Club built a wooden watchtower which burnt down in 1874.
1888 - Tunsberg Slottsfjellet, the present tower was built.
Tønsberg Fortress