Stara Gradiška was one of the most notorious concentration and extermination camps in Croatia during World War II, mainly due to the crimes committed there against women and children. The camp was specially constructed for women and children of Serb, Jew, and Romani ethnicity. It was established by the Ustaše (Ustasha) regime of the Independent State of Croatia (NDH) in 1941 at the Stara Gradiška prison near the village of Stara Gradiška. The camp was liberated in April 1945 by the Partisans.
According to the list of victims by name of KCL Jasenovac, the Jasenovac memorial site, which includes research as of 2007, the names and data for 12,790 victims of the camp have been established.
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The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.