Königswart Castle stood where the Nasenbach flows into the Inn River. It was a subsidiary castle of the Hohenburg lordship. Based on its name and location, Königswart was probably a royal toll castle.
According to legend, during the time of the emperor's absence (1056-1059), a robber baron robbed ships here. The emperor's widow, Agnes, promised as much land as he could ride around in one day to anyone who could put an end to the roguery. "Kuno Maier" then set out from Altdorf near Haag, defeated the band of robbers, and rode around the territory of the County of Haag on a white horse, which he subsequently acquired.
In 1202, Königswart, like Hohenburg, was owned by the Counts of Megling (Stampfl), 7 km downstream. In 1226, Königswart passed to the Bishopric of Regensburg and came under Haag administration in 1304. However, the old castle was only used for military purposes. By 1550, Königswart was a ruin.
Today, only the foundations of the once proud complex remain.
The castle was 125 meters long and 65 meters wide. To the north, at the mouth of the stream, there was an approximately 125-meter-long defensive structure consisting of earthworks and ditches.
Access to the castle was from the south via a wide, deep moat, in front of which was a raised area measuring 125x125 meters.
A Romanesque capital belonging to the castle was walled into a small chapel in the 19th century. This capital is the oldest secular work in the County of Hague.
(Source: R. Münch)