The Catacombs of Marcellinus and Peter are ancient catacombs situated near the church of Santi Marcellino e Pietro ad Duas Lauros. Their name refers to the Christian martyrs Marcellinus and Peter who, according to tradition, were buried here, near the body of St. Tiburtius. In 2006, over a thousand skeletons were discovered in these catacombs; the skeletons were stacked one on top of each other and still bore the togas they were buried with.
The Catacombs are open only on Saturdays and on Sundays for individual visitors.
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.