Noun
Residenzstadt (plural Residenzstadts or Residenzstädte)
(now chiefly historical) A town which was the seat of a court, especially of a German prince. [from 19th c.]
Marion Linhardt describes the change in audiences and repertoire with regard to Vienna in her book Residenzstadt und Metropole. Source: Internet
In 1709, Berlin merged with the four cities of Cölln, Friedrichswerder, Friedrichstadt and Dorotheenstadt under the name Berlin, "Haupt- und Residenzstadt Berlin". Source: Internet