St Arbogast Church in Surbourg takes its name from and pays homage to the first bishop of Strasbourg, Saint Arbogast. The dates originally from the 11th century and is part of the Route Romane d'Alsace, along with the Abbey Church of Saints-Pierre-et-Paul in Wissembourg and the Church of Saint-Ulrich in Altenstadt.
The building rises on a basilical plan with three ceilinged naves ending in a transept and vaulted apses in cul-de-four. Inside, the large arcades rest on alternating supports: columns with cubic capitals and masonry pillars with simple transoms. Note the quality of the apparatus in small rubble alternating red and gray sandstone (outside the nave and apse of the north apsidiole) as well as the decorative size of the facings (inside pillars of the nave).
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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.