The local airport opened in 1973, mainly serving light aircraft for business use and flight instruction.
It is not clear when Roskilde became a market town but it was certainly enjoying trading privileges under King Eric II who reigned from 1134 to 1137.
These privileges were firmly established when the Roskilde City Council granted market town status to other towns on Zealand on 15 June 1268.
Roskilde has a long history, dating from the pre-Christian Viking Age.
Its UNESCO-listed Gothic cathedral, now housing 39 tombs of the Danish monarchs, was completed in 1275, becoming a focus of religious influence until the Reformation.
In the 1970s, the city benefited from the opening of the university and from the completion of the Holbæk Motorway connecting it to Copenhagen.
Roskilde has the oldest operational railway station in Denmark, with connections across Zealand as well as with Falster, Lolland, and Jutland.Absalon, the Danish bishop, had a brick church built on the site of Harald's church in 1170.Today's cathedral was completed in 1275 after five of Absalon's successors had contributed to its construction.With the development of the rail network in the 19th century, Roskilde became an important hub for traffic with Copenhagen, and by the end of the century, there were tobacco factories, iron foundries and machine shops.Among the largest private sector employers today are the IT firm BEC (Bankernes EDB Central) and GPI (Glim Plastic Industri), specializing in plastics.the city is a business and educational centre for the region and the 10th largest city in Denmark.