The first, thirteenth-century bishop’s court in Iłża was located in the so-called Old Town. It was destroyed during one of the Tatar invasions, which probably caused the settlement and the court to be moved to the other side of the river at the end of the 13th or at the beginning of the 14th century. There, in the second quarter of the fourteenth century, at the initiative of bishop Jan Grot, a stone castle was to be built. It served as a fortified seat of bishops and an administrative center, from where an extensive land estates were menaged. The castle housed the military crew, and later the starosts, and the castle law court for the subjects of Kraków bishops were also located there. The first written mention of the castle appeared in 1334, when Jan Grot issued a document with the annotation “in castro nostro”.
The castle was one of the better fortified seats of Kraków bishops, as evidenced by the refuge of Jan Grot in it, during a dispute with King Casimir the Great over tithes, when royal troops unsuccessfully besieged the castle and the town of Iłża. Despite this, in the third quarter of the fourteenth century, the first reconstruction was carried out by bishop Florian of Mokrsko, carried out on the occasion of surrounding the town with walls between 1367 and 1380.
In the 16th century, subsequent bishops, including Jan Konarski and Filip Padniewski, transformed the castle into a more comfortable residence with bastion fortifications. In 1588, it was destroyed by a fire, which was the reason for another, renaissance renovation and modernization under bishop Marcin Szyszkowski in the years 1616 – 1630. The castle was seriously damaged by the Swedes in 1655 and again ravaged two years later by Rákóczi’s army. Reconstruction and repairs were carried out in the second half of the 17th and 18th centuries. It was then that the modern boulevard was built on the eastern side of the castle, and the residential buildings were enlarged and modernized, although from the second half of the 18th century the castle began to deteriorate, which was deepened by the devastation of the fighting with the Bar Confederation. After a fire in the early 19th century, the castle fell into complete ruin.
The castle was built on a high hill overlooking the Iłżanka River, 42 meters high. The first stage of the castle’s development included the perimeter walls made of unworked stone with a gate on the west side and a stone, cylindrical tower. It probably served as a bergfried, i.e. a place of final defense, not inhabited during peace, but only used as a prison or warehouse. In its lower part, stairs were placed in the thickness of the wall, leading to the level slightly below the moulded entrance portal, which was pierced a few meters above the level of the courtyard. Ladders were probably already used to reach the upper floors of the tower. A small residential house was built on the north-west side.
In the second stage of expansion, the weakest and most critical element of the castle, in the form of the entrance gate, was reinforced. It was preceded by a four-sided tower protruding in front of the perimeter of the walls, reinforced with massive corner buttresses. The passage led along its axis, from where it turned at right angles to the north (similar to the castle of Bishop Oleśnicki in Pińczów), over a bridge set on a series of stone pillars. The entrance to the castle, 7 meters wide, was above the slope of the hill and rose upwards. It was ended by the last raised span of the bridge.
The main residential house with a single-track layout was then located at the northern part of the defensive wall, and the remaining buildings were located around the courtyard. The castle towers may have also had utility functions. One of them could house a chapel with a late-Gothic decorative bay window, attributed to the Zbigniew Oleśnicki foundation. The extensions also led to the creation of an outer bailey adjacent to the castle from the north. There was a well, stables and economic buildings.
In the 16th century, other buildings were erected adjacent to the perimeter wall and surrounding the inner courtyard, and the outer bailey was surrounded by bastion fortifications. At the beginning of the 16th century, the town fortifications were also modernized, which were connected to the castle, though not directly, but by adding to the rocky and steep slopes of the hill. Inside the town walls, about 800 meters long, covering 4 hectares of the town, there was the Iłżanka river, which previously separated the castle from Iłża and constituted its natural protection. On the southern side, Lake Iłżeckie played a similar role for the town. The walls were made of unworked stone and topped with battlement. In their length, there were no regularly spaced towers, but only a rectangular tower called Hell on the west side (used as a prison) and a rectangular, low and small tower in the south-east corner. Both were probably built in the 16th century. Two gates led to the town: the eastern one called Bridge Gate and the western one called Radomska Gate. They both lay on one line running along the northern side of the market square. The Radomska Gate was located in a four-sided gatehouse, protruding in front of the face of the wall. The Bridge Gate probably had a similar form. During the expansion from the 16th century, two more gates were created: Solecka in the north and Krakowska in the south.
The castle is now in a state of secured, accessible to explore ruin. Historical events, such as knights tournaments, take place regularly on its premises. In recent years, restoration works have been carried out. The main tower has survived in the best condition among the original buildings, although it is deprived of its original levels, metal stairs were installed inside it, and the top was covered with an ugly umbrella.
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