Archeological finds at the rock’s foot, tracking at least approximately the history of the colonization of Sloup, prove the presence of bearers of the Globular Amphora culture at a time more than 2000 BC; and of the one thousand years younger Únetice culture, then of the Lusatian culture, shortly before BC of the Celts and shortly after BC of the Germanic population of the so-called podmokelská group. The finds are, however, represented by isolated artefacts which are not sufficient enough to prove a more continuous colonization.
With the arrival of the Slavs circa 6th century AD, a few Slavic tribes settled in the area called Záhvozdí, a vast border forest, on the margin of which there was also Sloup. Most of the area was inhabited by the Lusatians, probably from the tribe Milceni. To its western part reached the Bohemian tribe Decani and from the east the tribe Charváti.
From the Rock Castle development we can draw the conclusion that the presence of a permanent settlement, starting in at least the 7th century lasting over more centuries, could possibly have had the influence on the rock itself. Therefore, certain elements’ influence might date back to older times than is commonly believed. Unlike most castles, the history of which usually started with the arrival of a wealthy man establishing a fortified residence on the “green field”, this inaccessible rock, which has stood here ever since, already drew attention before any feudalists came.
There is no proof for such a statement, yet at the same time we can’t exclude the possibility that for example the jug-shaped corn storage was not created by the Slavs long before the arrival of the Ronovec family. Grain and its safe storage were strategically important, and as we know in other areas there were similar jug-like diggings into the clay soil. Therefore, we can assume that a similar way of supply storaging was known to the Slavs.
A heavy influx of German settlers in the course of the first colonization wave in the 13th century significantly moved the language border. In most of the villages of this colonized border area, the Czech language was gradually fading out. Before the Thirty Years’ War, this language boundary line had moved as far as the south of Ceská Lípa.