Odense include the Radisson SAS HC Andersen Hotel, the First Hotel Grand with its brasserie bar, the 68-room Old English-style Clarion Collection Hotel Plaza, City Hotel, which is in close proximity to the Hans Christian Andersen museum, and the 140-room Danhostel Odense City. Nonnebakken, a hill in the Odense area, is the site of one of Denmark's six former Viking ring castles, built during the reign of Sweyn Forkbeard, who had forced his father Harold Bluetooth to leave the country and seek refuge by the Jomsvikings in Wollin (modern Poland) in around 975. The fort provided its occupier the command of
Odense early 20th century. The 1901 census recorded 40,138 people, growing to 47,224 in 1911, 61,969 in 1921 and 87,090 in 1935. During the Second World War, the population passed the 100,000 mark, reaching 103,107 in 1945. It continued to grow in the post war years, with 120,570 recorded in 1955 and 133,384 in 1965; the city reached a population of 139,490 people in 1970, a time when it was developing as a university city after Odense University was established in 1966. Residents began to move out of the centre into the suburban areas which were included in Odense Municipality after