Schloss Montabaur is dating back to the year of 959, when it was first mentioned as “Castellum Humbacense”. It was initially a residence for Duke Hermann of Swabia. In 1018, the castle and its surrounding lands came under the control of the Archbishop of Trier. The castle was destroyed in 1212, but rebuilt five years later by Archbishop Theoderich von Wied. The castle was renamed “Mons Tabor” - inspired by Mount Tabor in Israel - which evolved into Montabaur.

In the late 17th century Schloss Montabaur underwent a baroque transformation.This renovation gave the castle much of its current appearance. Nowadays the unusual yellow castle - situated on a hilltop high above the town of Montabaur - is visible from afar.

The castle functions today as a conference- training center and hotel while maintaining its status as a protected monument of German architecture.