Dunseverick Castle is located on the peninsula near the small village of Dunseverick and the Giant's Causeway.
Saint Patrick is recorded as having visited Dunseverick castle in the 5th century AD, where he baptized Olcán, a local man who later became a Bishop of Ireland. The original stone fort that occupied the position was attacked by Viking raiders in 870 AD.
In the later part of the 6th century AD, this was the seat of Fergus Mor MacEirc (Fergus the Great). Fergus was King of Dalriada and great-uncle of the High King of Ireland, Muirceartaigh (Murtagh) MacEirc. It is the 500 AD departure point from Ireland of the Lia Fail or coronation stone. Murtagh loaned it to Fergus for the latter's coronation in western Scotland part of which Fergus had settled as his sea-kingdom expanded.
The O'Cahan family held it from circa 1000 AD to circa 1320 AD, then regained it in the mid-16th century. Last one to have the castle was Giolla Dubh Ó Catháin, who left it in 1657 to settle in the Craig/Lisbellanagroagh area. Post 1660 they use the anglicised name McCain/O'Kane.
The castle was captured and destroyed by General Robert Munro in 1642 and his Cromwellian troops in the 1650s, and today only the ruins of the gatelodge remain. A small residential tower survived until 1978 when it eventually surrendered to the sea below.
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.