Although no traces of these buildings have been discovered, in 1997 archaeologists found the remains of Viking ships in the Isefjord, the oldest of which is dated to 1030.
At the time, there were also two churches in the area: St Jørgensbjerg, an early stone church, and a wooden church discovered under today's St Ib's Church.
As a result of Absalon's influence, many other churches were built in the vicinity, making Roskilde the most important town in Zealand.
Coins were minted there from the 11th to the 14th century.
The Sankt Hans psychiatric hospital serves the Capital Region with specialized facilities for forensic psychiatry.
The cathedral and the Viking Ship Museum, which contains the well-preserved remains of five 11th-century ships, attract more than 100,000 visitors annually.
In the 1970s, the city benefited from the opening of the university and from the completion of the Holbæk Motorway connecting it to Copenhagen.