Ostrów Tumski Castle, Wrocław

The castle complex occupies a compact plan of stone and brick buildings surrounded in the medieval period by a continuous defensive wall. Surviving masonry shows Romanesque and Gothic building techniques, with large brick walls founded on point foundations and heavier stone elements where towers and the main residence once stood. Much of the medieval fabric lies buried beneath later streets and gardens, while fragments have been preserved within later structures.

The late 12th‑century palatium served as the main donjon and measured roughly 15 by 17 metres. Built in stone and brick, it rose originally two or three storeys and housed at least one heated chamber recorded in 1239. The main body of the palatium survives up to the first, partly the second, floor level and now forms the basement and ground floor of the building at Świętego Marcina 12. Elements of the palace fabric are also visible in the Dom Notre Dame, where a basement route interprets some of the remains.

A large late‑12th‑century eighteen‑sided brick chapel once stood near the residence. It had an internal diameter of about 19.5 metres, walls some two metres thick, foundations set on pointed footings linked by arches, and a central pier nearly two metres across slightly offset from the geometric centre. Its walls met the foundations with vertical buttressing strips, and a small room to the north‑east likely functioned as a sacristy. Evidence indicates the interior was probably roofed with beams rather than stone vaulting. That octagonal chapel was taken down in the fourth quarter of the 13th century and survives now only in archaeological traces.

Work begun in the 1230s produced a late Romanesque brick chapel with a cruciform plan, completed about 1250. Its design originally envisaged four interior pillars and a nave span near eleven metres, with alternating short and long sides and short arms each ending in three rectangular apses; a square presbytery on the north‑east closed by an apse formed the liturgical east. During construction the plan was altered so that pillars ran along the longer sides. The building was dismantled by the 15th century; its ground‑floor walls remain below a road and a monastery garden. Excavations recovered granite fragments including a plinth and two wall bases now in the Museum of Architecture, and a jamb piece interpreted as part of a lantern fixture.

About 1270–1280 a two‑storey octagonal ducal chapel was erected, its nave spanning roughly 17.6 metres inside and provided with a short quadrangular, two‑bay presbytery to the east. The west face of the octagon abutted the palatium, leaving the north and south octagonal faces with three‑sided elevations separated by pronounced buttresses. The lower storey was sunk roughly 1.2 metres and served practical, non‑liturgical functions such as storage and handling of goods. The chapel appears to have included an upper gallery and tall gabled façades. After the site passed to the church chapter the chapel was partly demolished and its north walls were reused within later domestic structures; surviving sections are visible in the basement of the building at Świętego Marcina 12.

The foundation begun by Henryk IV to the Virgin Mary, later completed in simplified form and known subsequently as the church of St. Martin, dates from the 1280s although work stopped in 1287 and was only later finished. That church suffered heavy damage in 1945, its walls burned, and was rebuilt with alterations between 1957 and 1960 by Tadeusz Kozaczewski; the present building reflects that post‑war reconstruction.

A line of 13th–14th‑century curtain wall once enclosed the complex, constructed in brick to heights reconstructed at about six to seven metres, and pierced by two principal gates. A western water gate gave access toward the river, and an eastern gate provided the link to the rest of Ostrów Tumski; each gate was flanked by towers. A tower on the island side, about sixteen metres tall, survived into the early 19th century and served as the chapter prison; its foundations, measuring approximately 6.20 by 7.00 metres, survive beneath the road surface at the corner of the nearby church square.

Archaeological work in the 20th century exposed parts of the southern castle area, some of which were developed in 1968 for a monument, while the northern precinct remains incompletely excavated and incorporated into later institutional plots. Principal medieval walls, foundations and reused sections of chapel masonry survive in situ or built into later basements, offering a tangible sequence of the site’s long use.