St Twrog's Church is a small rural church at Bodwrog in Anglesey, North Wales. Built in the late 15th century in a medieval style, some alterations have been made but much of the original structure still remains. It has two 15th-century doorways (one later converted into a window) and some 15th-century windows. The bull's head decoration used on the church denotes a connection with the Bulkeleys of Beaumaris, a prominent north Wales family over several centuries. Set in a remote part of the countryside in the middle of Anglesey, it is dedicated to St Twrog, who was active in the late 5th and early 6th centuries. The church's tithes were paid for at least two hundred years to Jesus College, Oxford, which has historically strong links with Wales, and the college at one point built a house for the priest who served St Twrog's and a neighbouring parish.
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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.