<P> With the establishment of the Kalmar Union ( 1397 -- 1523 ) between Denmark , Norway and Sweden , by about 1416 Copenhagen had emerged as the capital of Denmark when Eric of Pomerania moved his seat to Copenhagen Castle . The University of Copenhagen was inaugurated on 1 June 1479 by King Christian I , following approval from Pope Sixtus IV . This makes it the oldest university in Denmark and one of the oldest in Europe . Originally controlled by the Catholic Church , the university 's role in society was forced to change during the Reformation in Denmark in the late 1530s . </P>
when did copenhagen become the capital of denmark
by about 1416 Copenhagen had emerged as the capital of Denmark when Eric of Pomerania moved his seat to Copenhagen Castle