Netum was a considerable ancient town in the south of Sicily. Its current site is at the località of Noto Antica, in the modern comune of Noto.
As a treaty was concluded in 263 BCE between the Romans and King Hieron II of Syracuse, Netum was noticed as one of the cities left in subjection to that monarch. Ptolemy is the last ancient writer that mentions the name; but there is no doubt that it continued to exist throughout the Middle Ages; and under the Norman kings rose to be a place of great importance, and the capital of the southern province of Sicily, to which it gave the name of Val di Noto. But having suffered repeatedly from earthquakes, the inhabitants were induced to emigrate to a site nearer the sea, where they founded the modern city of Noto, in 1703.
The old site is on the summit of a lofty hill about 14 km from the modern town and 20 km from the sea-coast: some remains of the ancient amphitheatre, and of a building called a gymnasium, are still visible, and a Greek inscription, which belongs to the time of Hieron II.
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.