The castle has changed several owners over the years, ranging from local nobility, Habsburgs, and a missionary Frederic Baraga.

[2] It is believed[weasel words] that the castle was built around year 1000 by the Patriarchate of Aquileia and managed by their local vassal knights named de Treuen.

With the demise of Counts of Celje, the castle was handed over to the Habsburgs as part of an inheritance agreement.

For some time, the castle hosted the Trebnje primary school; later it was turned into social housing.

The arcades on the left, northern side of the courtyard are hexagonal, supported by load-bearing walls and in the size of the ground floor.