Originally, Køge was located in the grounds of present-day Gammel Køgegård, approximately 1 km inland from the current town centre.

When sedimentation made the beach and marshlands along the coast suitable for building, the settlement relocated to the bay and Old Køge shrank to a few scattered houses.

In 1603, Elisabeth Bille, who had inherited the family's possessions in Old Køge from her father, started construction of a house which would stand at the site for almost two hundred years.

[2] In 1776 the property was acquired by Rasmus Carlsen, a local farmer and merchant, and his son Christen Rasmussen-Carlsen was in 1817 ennobled under the name Lange.

Active in politics, Hans Carlsen Lange was a member of the Landstinget, appointed by the king, and briefly, in the Cabinet of Monrad, served as Minister of Interior Affairs.

It was inaugurated on the occasion of her funeral by titular bishop N. F. S. Grundtvig who had married Hans Carlsen's sister the previous year.

In episode 16 of the television series, Gammel Køgegaard is used as a location for the home of Jytte's mother, where Alf Thyregod pays her a visit.