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Market town privileges were granted in 1441, but growth stagnated in the 17th century as the city suffered blockades and bombardments during the Swedish Wars.
The official and religious status spurred growth so in 1477 the defensive earthen ramparts, ringing the town since the Viking age, were abandoned to accommodate expansion.
In the 900s an earth rampart for the defence of the early city was constructed, encircling the settlement, much like the defence structures found at Viking ring fortresses elsewhere.
The rampart was later reinforced by Harald Bluetooth, and together with the town's geographical placement, this suggests that Aros was an important trade and military centre.
Whichever spelling local authorities choose, most newspapers and public institutions will accept it.
Some official authorities such as the Danish Language Committee, publisher of the Danish Orthographic Dictionary, still retain "Århus" as the main name, providing "Aarhus" as a new, second option, in brackets and some institutions are still using "Århus" explicitly in their official name, such as the local newsmedia Århus Stiftstidende and the schools Århus Kunstakademi and Århus Statsgymnasium for example.