Idstein Residential Palace

At the beginning of the 17th century, in the time of Prince Georg August Samuel von Nassau-Idstein, a castle in the style of the Renaissance was built in place of the outer bailey. An interior decoration in the Baroque style was completed around 1714. The master builder was Maximilian von Welsch, the stucco work, especially in the so-called Kaisergemach, were executed by Carlo Maria Pozzi. The ceiling and other paintings are by Valentin David Albrecht and Luca Antonio Colomba.
Source: Wikipedia (excerpt) "de.wikipedia.org/wiki/Burg_Idstein"

Henrich Heer, creator of Idstein Castle, copied his plans for his aristocratic clients: The similarity between HÖERHOF and castle is obvious.

(hoerhof.de/start/der-hoeerhof/die-geschichte/)

The gymnasium is housed in the Residenzschloss