Mogorjelo is a Roman villa rustica that dates from the early fourth century. It is situated on a hill off the Neretva branch, 5 km south of Čapljina.
An Italic settler had a private manor complex built for agricultural purposes on the Mogorjelo site in the mid first century CE. He located the building designed for processing agricultural produce (villa rustica fructuaria) on a salient on the hill (the ground plan of the villa lies near the north or main gate of the walls of later date), and the residential building (villa rustica habitatoria) on the south slope exposed to the sun. This building burned down in the third century.
In the early fourth century, a state-owned estate was constructed over the ruins, with a villa which now forms the major feature of the complex. During the third century the property probably changed hands to become state-owned. The estate was destroyed in a major fire. The latest coins discovered on this site, in a layer of soot, were minted by Honorius in 388, so that it may be assumed that Mogorjelo fell into enemy hands some time between 401 and 403 with the Visigoth invasion of these parts. Life continued in these new circumstances.
In the mid fifth century, two basilicas were erected within the ruined perimeter walls in the north-eastern corner of the former villa, first one to the north and immediately thereafter the one to the south. To judge from various conversion works within the buildings, it appears that they were converted to residential use. Some items of Carolingian provenance, dating from the ninth century, have been found in the round tower and adjacent premises. Burials took place all over the site and its surroundings from the period of construction of late antique churches to the nineteenth century.
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.