When was Freetown Christiania in the territory of Copenhagen formed?

Freetown Christiania, also known as Christiania, is an intentional community and commune of about 850 to 1,000 residents, covering 7.7 hectares (19 acres) in the borough of Christianshavn in the Danish capital city of Copenhagen. It was temporarily closed to visitors by residents by consensus in the plenum in April 2011 and a later occasion, but later re-opened.

Christiania has been a source of controversy since its creation in a squatted military area in 1971. Its cannabis trade was tolerated by authorities until 2004. Since then, relations between Christiania and Danish authorities have been strained. Since the beginning of the 2010s, the situation has been somewhat normalized and Danish law is now enforced in Christiania.