Koldinghus is the last of the ancient royal castles on the peninsula of Jutland, Denmark. The castle is situated on the south central part of the peninsula in the town of Kolding. The castle was founded in the 11th century and was expanded over the course of centuries and has since then had many functions ranging from fortress, royal residency, ruin, museum and the location of numerous wartime negotiations.
The castle was originally founded by Christoffer I in 1268 but the oldest remaining part of buildings is the north side facing the castle lake originally built by king Christoffer III (1441–1448). The western side was later built by king Christian 1 (1448-1481). King Christian III built the south side and the small towers in the courtyard.
Today the restored castle functions as a museum containing collections of furniture from the 1500s to present, Roman and Gothic church culture, older Danish paintings and crafts focused on ceramics and silver.