[1] A document from 1065 mentions that Duke Frederick of Lower Lorraine received the castle as a fief from the King.

Later, Emperor Henry IV gave the castle to Frederick's brother, Count Adalbero III of Luxembourg, who was Bishop of Metz.

[1] A deed from 1485 reports that Count John II .... in 1459, because of the war, began to fortify and guard the two cities.

[4] The summer house had been designed by architect Christmann Stromeyer from the Electorate of the Palatinate and stood on the southeastern edge of the cliff .

[4] Drawings by Hienrich Höers provide a reliable and authentic image of the topography of the palace complex in the 17th century.

In October 1983, excavations next to the road in the valley, performed while preparing the foundations of a technical annex, unearthed a part of these extensive fortifications in several different layers.

The forecourt on the Saar side was bounded on the northwest by the Botzheim building, named after the chief forester who resided there in 1728.

[9] It was restored around 1696 by architect Josef C. Motte, nicknamed la Bonté, on the orders of Countess Eleonore Clara of Hohenlohe-Gleichen, the widow of Count Gustav Adolph and her son Louis Crato.

The wing adjacent to the road to St. Arnual Rauschen Thal (today's Talstraße) was, according to reconstruction plans that have been preserved, carried out à la mode.

During sewer repairs in August 1977, a three-metre thick wall was discovered that had been part of the main tower of the Renaissance castle.

In 1735, Princess Charlotte Amalie, née Countess of Nassau-Dillenburg, the widow of Prince William Henry divided the possessions of the Walram line of Nassau among her sons.

When William Henry came of age in 1741, he commissioned[12] the architect Friedrich Joachim Stengel from Zerbst to write a report on the structural condition of the Saarbrücken Castle.

Stengel had studied architecture at the Royal Academy of Arts in Berlin from 1708 to 1712 and had been appointed court architect in Usingen in 1733.

The new design did away with any defensive functions and reflected recent changes in the accepted princely lifestyle and provided a more open attitude, free access to outer courtyards and garden and a more comfortable, more splendid and refined interior.

The new princely palace was planned on the site of the old castle on the Saar, with residential and administrative buildings dominating the cityscape.

Space for the new palace was created by slighting the old castle walls, filling in the moat and diverting the river Saar.

The staggered terraces on the slope towards the Saar were expanded to create space for the new, larger Baroque garden.

Two equally long wings were attached to the corps de logis and the central pavillon, surrounding the cour d'honneur and thereby creating an additional living space.

The four corners of this horseshoe shape were emphasized with pavilions reminiscent of the defensive towers of the earlier castle.

The corps de logis were accessed via two representative main stairs on the left and right of the central courtyard pavilion.

From the entrance hall, the main staircase (French: Escalier d'Honneur) led to the audience chambers of the princely family in the piano nobile, and from there to the mezzanine to the sumptuously furnished Grand Salon.

Architect Johann Adam Knipper rebuilt the heavily damaged north wing on top of the preserved baroque vaults.

In 1872, the owner of the adjacent part of the castle, the iron works magnate Karl Ferdinand Stumm, commissioned architect Hugo Dihm to build a new hall to fill the gap left by the demolition of the central pavilion.

Erich Fissabre and Alfred Werner Maurer had previously made the reconstruction drawings and the inventory of the baroque castle.