In the 4th century, on the site of the later Landshut Castle, there was a late Roman fort to secure military supplies along the Moselle to the Rhine border of the Roman Empire. The rectangular complex has a circumference of 60 m by 30 m with 1.8 m thick walls made of quartzite stones. The complex was reinforced by six to seven towers, each with a circumference of 6 m by 6 m.
The hilltop castle that stands today on the foundations of the Roman fortifications was built at the end of the 13th century by the Archbishop of Trier, Heinrich von Finstingen. According to written sources, there was already a castle in Bernkastel around 1000. Another castle complex belonging to the Counts of Blieskastel is documented in the 12th century and was destroyed by the Archbishop of Trier.
After the Counts of Blieskastel died out, their heirs, the Counts of Salm, sold the castle and bailiwick to the Electorate of Trier in 1280. In 1505, the castle in the Electorate of Trier was first referred to as "Landshut". It was the seat of a bailiff who administered the Trier district of the same name. On January 8, 1692, Landshut was destroyed by an unfortunate fire and has never been rebuilt since. It has been owned by the city since 1920. The ruins are also used as a restaurant and rest stop. The walk-in keep offers a view of the Moselle valley. During routine maintenance work in 2012, remains were discovered that could date back to the 5th or 6th century. It may be one of the oldest castles in the Moselle valley (Wikipedia).