The Macellum of Naples was the macellum or market building of the Roman city of Neapolis, now known as Naples. Due to the rise of the ground level the macellum is now located beneath the church of San Lorenzo Maggiore. The first construction dates to 5th or 4th century BC when the area was the location of the agora during the Greek period. When Neapolis became a Roman possession it was eventually transformed into a macellum. This structure was covered by a mudslide in the 5th century AD, probably as a result of flooding.
An early Christian basilica was constructed over the remains of the covered macellum. Consequently, this basilica was replaced by new construction over the centuries. As a result, the mud slide preserved the remains of the macellum,
The macellum had an entrance to the north, where the Via dei Tribunali runs now. The rectangular building consists of a porticoed area with workshops and an internal open courtyard with mosaic floors. In the middle of the courtyard was a tholos, a circular building used for food selling. Small tabernae, a laundry and the treasury can still be recognized.
Today the macellum can be visited as a part of the monumental complex of San Lorenzo Maggiore.
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.