Saint Eilian's Church is Grade I listed Celtic church, with a 12th-century tower, 14th-century chapel and a nave and chancel dating from the 15th century. In the chancel is a 15th-century rood screen, and there are traces of post-medieval wall paintings. A painting of a skeleton bears the inscription Colyn angau yw pechod ('The sting of death is sin'). The Church is named after Saint Eilian (Eilianus). Eilian of Rome also known as Eilian of Anglesey was a 6th-century saint who came from Rome to Britain where he lived as a hermit in the area north of Anglesey. His feast day is 13 January. The churchyard contains the war grave of a Royal Navy sailor of World War I.
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.