Tårnborg was originally the name of a small fortified town whose fortifications were most likely constructed by Svend Grathe in the middle of the 12th century.

In 1458, Christian I allowed the farmers in the new town of Korsør to use the land for grazing in return for the payment of an annual fee.

The proposal was approved but never realized, and in 1669, part of the land was instead acquired by Hugo Lützow (32 tønder hartkorn).

The land was supposed to be returned to the Crown in 1719 for inclusion in Antvorskov Cavalry District, but after a personal meeting with Frederick IV, Mogensen was allowed to keep the estate.

In 1749, it had finally reached the size of a "complete manor", or seat (sædegård), meaning that it comprised copyholds with a total area of more than 200 tønder hartkorn, a status that was rewarded with tax exemptions and other privileges.

In 1774 Eggers purchased one of the nine estates that was sold in public auction when Antvorskov Cavalry District was dissolved.

Niels Christian Eggers was like many other estate owners hit by the economic downturn that followed the state bankruptcy of 1813.

He had close ties to Christian IX by whom he was appointed to the Danish Constituent Assembly, and he was a member of Landstinget from 1849 to 1853.

[3] Taarnborg is today owned by I/S Tårnborg Parkhotel and forms part of Hotel Comwell Grand Park.