Rhuddlan Castle was erected by Edward I in 1277, following the First Welsh War. The castle was completed prior to the rebellion of Llywelyn the Last in 1282. The remains of older Norman castle at Twthill, built in 1086, is just to the south of the current castle.
In 1294 the castle was attacked during the Welsh rising but was not taken. It was attacked again in the by forces of Owain Glyndŵr in 1400. This time the town was badly damaged but the castle held out. In the latter 15th and early 16th centuries the castle's condition deteriorated as its strategic and administrative importance waned.
Rhuddlan Castle was again garrisoned by Royalist troops during the English Civil War, and remained a stronghold of King Charles I of England until well after the Battle of Naseby, being taken by Parliamentary forces under Thomas Mytton after a siege in 1646. Two years later, Parliamentarians partially demolished the castle to prevent any further military use. By the time Pennant passed through in 1781, it was largely ruined.
Rhuddlan was planned as a concentric castle. It has a unique 'diamond' in layout as the gatehouses are positioned at the corners of the square baileys instead of along the sides like at Flint, Harlech or Beaumaris. Records of construction costs show that it was the major piece of building work being carried out by the English during the late 1270s.
The inner ward has defensive walls with twin-tower gatehouses. The outer ward is surrounded by a curtain wall that has small towers and turrets. The castle had a three-sided moat, with the River Clwyd protecting its fourth side. Within the inner ward there was a great hall, kitchens, private apartments and a chapel. The outer bailey had a granary, stables and a smithy.
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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.