Castillo de Iznájar is an 8th-century castle perched on the high ridge. It has a triangular design, truncated on the northeast side, with its longest side facing south, and a large central space. It is surrounded by a stretch of wall with flanking towers at the southeast and southwest corners. The east side is closed by a rectangular building, which is attached to the west with a pentagonal tower at the bow, and another tower in the east. Early access to the castle is believed to have been from the east side through a building attached to the primitive rectangular tower.
References:Ehrenbreitstein Fortress was built as the backbone of the regional fortification system, Festung Koblenz, by Prussia between 1817 and 1832 and guarded the middle Rhine region, an area that had been invaded by French troops repeatedly before. The fortress was never attacked.
Early fortifications at the site can be dated back to about 1000 BC. At about AD 1000 Ehrenbert erected a castle. The Archbishops of Trier expanded it with a supporting castle Burg Helferstein and guarded the Holy Tunic in it from 1657 to 1794. Successive Archbishops used the castle's strategic importance to barter between contending powers; thus in 1672 at the outset of war between France and Germany the Archbishop refused requests both from the envoys of Louis XIV and from Brandenburg's Ambassador, Christoph Caspar von Blumenthal, to permit the passage of troops across the Rhine.