navy used several of its buildings for their headquarters, and they also constructed a large concrete bunker within the fortress walls. The buildings, including Haakon's Hall, were severely damaged during World War II but the buildings were later restored. Bergenhus is currently under the command of the Royal Norwegian Navy, which has about 150 military personnel stationed there. The fortifications Sverresborg fortress and Fredriksberg fortress also lie in the centre of Bergen. Haakon's Hall and Rosenkrantz Tower are open for visits by the public. Koengen, the central part of Bergenhus Fortress is also known as a concert venue. Prominent buildings Haakon's Hall Haakon's Hall () is a medieval stone hall located inside the fortress. The hall was constructed in the middle of the 13th century, during the reign of King Håkon Håkonsson (1217–1263). In medieval times, it was the largest building of the royal palace in Bergen. It is the largest secular medieval building in Norway and the likely inspiration to similar great halls that were built on the royal estates in Oslo and Avaldsnes. No written records survive of the construction of the hall. According to Håkon Håkonsson's saga the building was not there at the coronation of King Håkon in 1247. It does, however, state that it was used during the wedding celebrations of King Magnus Håkonsson and the Danish princess Ingebjørg Eriksdatter on 11 September 1261. The hall is built in Gothic style. In addition to the great hall, there were two more levels, a cellar and a middle floor. The hall's similarity to English structures of the same time, and the fact that monumental stone building was relatively uncommon in Norway at the time, has led to an assumption that the hall was designed by English architects, possibly the court architect of King Henry III of England, with whom King Håkon was on friendly terms. The hall has been hit by several fires, the first one as early as 1266. Upon the death of King Eirik Magnusson in 1299, Bergen lost its status as the main royal residence. From 1380 until 1814, Norway was in a personal union with Denmark, which meant that the royal castle in Bergen gradually fell into decay. In 1429 it was captured and burnt by the Victual Brothers (viktualiebrødrene), but a new stone portal from the mid-15th century shows that the hall was rebuilt after this event. Soon after, however, as