Københavns Amt
In the Middle Ages, when Denmark was divided into syssels, Lyngby-Taarbæk was part of Østersyssel. It later became a part of Copenhagen Fief, which was changed to Copenhagen County in 1661. Although Copenhagen County changed many times over the years, Lyngby-Taarbæk always remained within the borders. When the counties were disestablished in 2007, Lyngby-Taarbæk came under the new Capital Region of Denmark.