The town of Złoczów (Ukrainian: Золочів) is situated on the River Złoczówka, amongst the Woroniaki and Gołogór hills. It is currently the administrative centre of the Złoczów District in the Lviv Oblast of Ukraine. The town first appears in written sources in the 12th century. During the reign of Władysław Jagiełło, it was a royal village. In 1442, Złoczów was in the hands of Jan of Sienna. The Sienieński family built the first, presumably wooden, fortified residence (‘fortalitium’) in Złoczów, which is mentioned in written sources from the first half of the 16th century. In 1523, the settlement was granted Magdeburg rights by Sigismund I the Old. In 1532, Władysław Sieniński sold the town ‘cum foratlitio’ to the Górka family. In 1592, Złoczów was acquired by Marek Sobieski, Grand Standard-Bearer of the Crown (later also Voivode and Castellan of Lublin). The bastion castle that stands today was built between 1634 and 1636 by Jakub Sobieski, father of the future King of Poland, Jan Sobieski. After the Sobieskis, the castle was ruled by the Radziwiłł family, and in 1801, Złoczów, together with the neglected and ruined castle, was acquired by Count Łukasz Komarnicki. He restored the building and made it his principal residence.

The castle is situated on a hill in the south-eastern part of the town. It was built according to the fortification principles of the Old Dutch school. It has a quadrilateral ground plan, with four pentagonal bastions at the corners. Access to the stronghold was defended by a deep moat. The earthen fortifications were clad in stone at the base, with the corners accentuated by hewn stones. Hexagonal cavaliers (watchtowers) were erected at the corners of the bastions, featuring embrasures and the Sobieski family coat of arms on the side facing the foreground. The whole complex was reinforced by additional earthworks and a ravelin in front of the castle gate. On the axis of the northern curtain wall stood a two-storey gatehouse, accessible via a drawbridge spanning the moat. From the outside, the entrance was adorned with a rusticated portal, flanked by prominent volutes, with a lion’s head in the keystone of the archivolte. Above the lintel was a plaque (now in the courtyard) bearing the inscription: ‘Sub Tuum Praesidium Confugimus Santa Dei Gentrix’ (‘We take refuge under your protection, Holy Mother of God’). The whole structure was crowned by a strongly profiled cornice. Within the ramparts on the courtyard side were casemates, serving as accommodation for the garrison and as storerooms in the event of a siege. Adjacent to the western curtain wall stood a palace, built on an elongated quadrilateral plan, two storeys high, with rusticated corners. The ground-floor rooms, which included a chapel, were vaulted. The stone entrance portal was framed by Corinthian pilasters and crowned with a prominent entablature. The window frames were also made of stone: on the ground floor they were rusticated with a simple lintel, whilst on the first floor they featured triangular pediments. The courtyard contained outbuildings and a well. A gunpowder store stood near the gate.

Jan Sobieski restored the castle, which had been devastated during the Cossack wars. Złoczów, alongside Żółkiew and Jaworów, was one of the favourite residences of Jan III, by then King of Poland. In 1672, during the Polish–Turkish War, the castle was captured and garrisoned by Turkish troops. However, it soon returned to its rightful owner. In 1675, the stronghold successfully withstood Tatar attacks. In 1690, an enemy raid took John III by surprise whilst he was staying at the castle; however, once again, the castle’s fortifications withstood the assault. During the reign of King John, the earthworks of the fortress and the ravelin in front of the castle gate were reinforced. A two-storey rotunda was erected by the southern curtain wall of the castle, crowned with a dome featuring a small gallery (the so-called ‘Chinese pavilion’), decorated with Janina’s coats of arms. In the 18th century, two single-storey side pavilions were added to the complex. During the reign of John III, the castle gardens were also restored.

After the king’s death, the castle was inherited by his sons: Konstanty, and subsequently Jakub. Following the death of Jakub Sobieski, the castle passed into the hands of his daughter, the ‘princess’ Maria Karolina Sobieska. Before her death in 1740, Maria Karolina appointed Michał Kazimierz Radziwiłł ‘Rybeńka’ – her childhood sweetheart – as her principal heir. However, the Radziwiłł family took little interest in the now-out-of-fashion fortified residence. By the end of the 18th century, the building was dilapidated and on the verge of ruin. Count Łukasz Komarnicki saved the castle from destruction, but his son, Aleksander, leased the building to the Austrian government to be used as barracks. In 1872, the occupying authorities purchased the castle from Aleksander’s heirs. The palace building was converted into a district court and a prison, whilst the so-called ‘Chinese pavilion’ became a prison chapel. The castle remained in this state until the First World War. After the war ended, a tragic period in the residence’s history began, as many bloody events soon took place within the castle walls. During the Polish–Ukrainian War over Eastern Galicia (1918–1919), the castle was once again converted into a prison, where Ukrainians murdered several dozen Poles. During the Second Polish Republic, the building also served as a prison. After 17 September 1939, the prison was taken over by the NKVD, which held Polish and Ukrainian opponents of the new regime there. Following the outbreak of the Soviet–German war on 22 June 1941, NKVD officers carried out a massacre of the prisoners in the Złoczów prison, burying the victims’ bodies, amongst other places, in the castle courtyard. The massacre at Złoczów prison served as a pretext for a pogrom against the Jews, who were accused of collaborating with the NKVD. The castle was also the site of executions of Złoczów’s Jewish population, carried out by the Germans (including on 4 July 1941).

The residence served as a prison until 1954; in 1979, the historic building underwent renovation, after which it was converted into a museum. Further renovation work took place in the first decade of the 21st century. The castle is currently the seat of the ‘Złoczów Castle’ State Museum-Reserve, a branch of the Lviv Art Gallery. The so-called Chinese Pavilion, meanwhile, houses the Museum of Eastern Cultures.