Trebnje Castle, Medieval castle in Trebnje, Slovenia

Trebnje Castle stands on the right bank of the Temenica, on a slope below Bukovje. Around 1530 the original tower was rebuilt into a massive Renaissance four-winged building with three square towers and one round tower. Four single-storey wings enclose a rectangular courtyard; the north and east arcades are six-sided, and entry is through a vaulted passage with two Baroque portals.

The castle was probably built around 1000 by the Aquileia patriarchs and held by their vassal knights of Trebnje, first mentioned as Konrad de Treuen in 1218. It is first documented in 1386 as "Turn ze Treuen". Around 1530, due to Turkish raids, the tower was fortified and rebuilt as a four-winged Renaissance building with three rectangular towers and one round tower.

The castle hosts exhibitions by local artists and serves as a venue for events organized by the Trebnje Municipality. Visitors can experience contemporary cultural activities while exploring a place deeply rooted in the town's identity.

The castle stands on the right bank of the Temenica, on a slope below Bukovje. Entry is through a wide vaulted passage flanked by two Baroque portals. Inside, a rectangular courtyard is surrounded by arcades, with a staircase linking the ground floor to the upper storey. The building now holds social housing, so the courtyard is best viewed from outside.

A probe survey south of the walls found the remains of an unidentified wall with foundations 2.36 m thick, plus traces of a 10 m wide ditch and an outer ditch beside it. It is still unclear whether any medieval building elements survive in the present castle.