Kozjak Castle, castle ruin near Trebnje, Slovenia

Kozjak Castle is a ruin sitting on a rocky hill in Dolenje Selce, surrounded by forests and fields. The remaining stone walls show the rectangular layout of the original building, with traces of towers and rooms that visitors can see as they walk through the site.

The first written record of Kozjak Castle dates to 1332, though documents suggest a knight named Ulrik of Kosieck already owned it in 1274. The fortress declined gradually from the 17th century onward and was completely abandoned by the 1800s, after which nature reclaimed the site.

The castle is named after the Kosieck (Slovene: Kozjaški) knightly family, first recorded in the 13th century, who took their name from Kozjak. Josip Jurčič set his tale Jurij Kozjak here, describing castle life and Ottoman raids. The ruin is now a registered immobile cultural heritage site.

The site has no shops or facilities, so bring water and wear comfortable shoes for the visit. The ruins are not restored, so care is needed when walking through the old stone structures, and while the climb up the hill is not difficult, it does take some time.

Josip Jurčič, a Slovene writer, set his tale Jurij Kozjak at the castle, describing the life of the castle lords, Ottoman raids, and the surroundings of Kozjak. The story is not a novel but a novella (povest), and it made the ruin a literary landmark.