Apollonia, known in the Early Islamic period as Arsuf and in the Crusader Kingdom of Jerusalem as Arsur, was an ancient city on the Mediterranean coast of today's Israel. Founded by the Phoenicians during the Persian period in the late sixth century BCE, it was inhabited continuously until the Crusader period, through the Hellenistic, Roman, and Byzantine periods, during the latter being renamed to Sozusa. It was situated on a sandy area ending towards the sea with a cliff.
It fell to the Muslims in 640, was fortified against Byzantine attacks and became known as Arsuf. In 1101 it was conquered by the Crusader Kingdom of Jerusalem, and was a strategically important stronghold in the Third Crusade, during which the Battle of Arsuf (1191) was fought nearby. The fortified city and the castle fell to the Mamluks in 1265, when both were completely destroyed.
The site of Apollonia–Arsuf was excavated in the 1990s and opened for visitors as Apollonia National Park in 2002. The above-ground remains before the excavations included the medieval city wall and moat, enclosing an area of about 90 dunam, a Crusader castle with a double-wall system with an area of about 4 dunam, a port with built jetties and a sheltered anchorage, protected by a sandstone reef.
Large amounts of pottery were recovered in the area surrounding the city, mostly of the Byzantine and early Islamic period, indicating that the city extended significantly beyond its old walls in the 7th century. A large Roman-era villa maritima was uncovered to the south of the site.
References: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.