The Chapel of Saint Germanus (Chapelle Saint-Germain) is one of the earliest surviving places of Christian worship in the Cotentin Peninsula. It is a small building with walls built from small pieces of shale arranged in a herringbone pattern. The chapel consists of a short nave, and transepts and a choir each formed from an identical apse with half domed roofs. This tri-lobate plan, which is unusual, is the result of a reconstruction in the 9th or 10th century on remains of a palaeo-Christian basilica which has been revealed by archaeological excavations. In the 17th century, the chapel was topped by a tower which in turn replaced an older tower structure.
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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.