The Church of St Hywyn, Aberdaron, Gwynedd, Wales, is a parish church dating from the 12th century. Its origins are earlier, as a clas church from the 5th to the 7th centuries. Further building, including the construction of the second nave, took place in the late 15th or early 16th centuries. Its importance was as an embarkation point for the abbey on Bardsey Island which became a significant site of pilgrimage in the Middle Ages. The Reformation saw the church's decline, and by the 19th century it was a ruin. In the 1850s a new church, Eglwys Newydd, was constructed inland, but proved so unpopular that St Hywyn's was restored.
The church comprises two naves, of equal length but of differing dates; the Northern is largely 12th century while the Southern dates from the 14th century. The building is constructed of rubble with slate roofs and a bellcote. The interior, which was refurbished in 2006 has a hammerbeam roof. The internal arcade is from the 15th century. Two carved boulders within the church commemorate a pair of 5th or 6th century priests, Veracius and Senacus.
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.