The first documentary mention of a castle in the vicinity of today's ruins dates to the year 1243. In that document, the knights – Heribert, Udo and Winand – gave their castle Elector of Cologne, Konrad von Hochstaden, who in turn enfeoffed them. Around 1250, Rudolf Boos von Waldeck built the lower bailey and both wards are mentioned in a document in 1285. The archbishop authorized the family to act as landlords of the area, through commercial contracts with Cologne, thus establishing the aristocratic line of the family that endured until 1833. This main seat would be the central administration of mills, offices, and the residence for barons, counts, and noble visitors during the summer. Political connections through deals, commerce and military control against the French guaranteed almost six hundred years of influence. The surname Boos is related to ancient mediaeval German words meaning "lead", "nobleman", or "angry", possibly used to indicate the residents of the castle, hence the name variation "Castle of Boos-Waldeck" seen in some documents. In French it is cited as the castle of "Bois Walthecce" or "Boosse de Walthecce". Below, nearer the valley, the lower bailey was established, possibly to enclose the houses of the joint owners of the castle. It is possible that the lower ward had been built around 1250 by the aforesaid Rudolf. Some documents mention both wards of the castle in 1285. The remnants of the lower bailey were only rediscovered and identified as such in recent years when the land was prospected. With the new building of the comital-Palatine tower, the castle now consisted of three parts: a new tower that had been built over the previous two wards and two lower baileys: the old upper and the old lower bailey.
Timeline
1124 First mention of Archbishop Konrad about "Waldeck area". 1242 The knights Heribert, Udo and Winand buy the rights to use their assets from the Archbishop of Cologne. 1250 Building of the bailey by Rudolf Boos von Waldeck. 1325 First well-known attempt to host multiple families of the castle was regulated. Beside the sex of the Waldeckers, in three lines were also the families of Hartwin von Winningen, Metz, Sabershausen. 1331-36 The knights of the castles Eltz and Boos-Waldeck set up a resistance force of 50 knights against the arrival of Archbishop Baldwin, but were defeated near Gegenburgen. 1361 The brothers Johann and Emmerich Boos von Waldeck recognize the authority of the Archbishop of Cologne, which was acknowledged as a chivalrous, but would not give any access to the castle. 1370 Johann IV Boos von Waldeck married Else of Montfort. The great-grandchild of this married couple, Simon Boos von Waldeck, received earnings, until 1480, the ruin of Montfort. Henceforth the descendants of this bloodline would be called “Boos von Waldeck und Montfort”. 1398 Ruprecht from Pfalz conquered the castle, after Johann Boos von Waldeck had died. In the peace treaty of 29 March, Ruprecht was granted access for living in the new tower, to keep occupied "on the neck". Thus the authority of the Palatinate became a neighbour enhancing the influence of the family in the business of the region. 1469 Geopolitical changes partially affect the administration. 1557 Beside the Boos von Waldeck there are only two families living in the castle. 1689 The French partially destroy the castle. 1720 Colonel William Lothar Baron Boos von Waldeck, who lived in Koblenz, settled a summer house in the bailey. 1833 The Boos von Waldeck, facing new geopolitical trends after the Napoleonic Wars, sold all its holdings in the Rhineland, thus also the newly built Boos-Waldeck Castle. 1850 Some of the landmarks, support stones, were removed from the castle to build other houses on the ward area, accelerating the castle's decay into ruins.
