What city used to be called Christiania?

Answer:
Oslo
Founded around 1048 by King Harald III of Norway, the city was largely destroyed by fire in 1624. The city was moved under the reign of Denmark-Norway's King Christian IV. It was rebuilt closer to Akershus Castle, as Christiania (also spelled Kristiania in late 1800s). In 1925, the city reclaimed its original Norwegian name, Oslo
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