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. Slottsfjellet Museum Slottsfjell Museum (Slottsfjellsmuseet) was established in 1939 as the Vestfold Fylkesmuseum. It is now an associate of Vestfold Museum (Vestfoldmuseene). The exhibitions in the museum present Vestfold's cultural history with particular, emphasis placed on whaling and shipping, urban and rural history in Vestfold to World War II References Other sources Gjerset, Knut History of the Norwegian Peoples (MacMillan, 1915) Larson, Karen A History of Norway (Princeton University Press, 1948) External links Tunsberghus Tunsberg Slottsfjellet Tunsberg Slottsfjellet photo gallery Slottsfjellsmuseet website Tønsberg Buildings and structures in Vestfold og Telemark Castles in Norway Forts in Norway Military installations in Vestfold og Telemark