Irish castle. I can find the picture everywhere but it never says where it's from.
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This is the Rock of Cashel. Located at Cashel, County Tipperary, Ireland.
This castle is also known as: Cashel of the Kings and St. Patrick's Rock.
It is the Rock of Cashel.
The Wikipedia article says,
The rock originated in the Devil’s Bit, a mountain 20 miles (30 km) north of Cashel, when St. Patrick banished Satan from a cave, resulting in the Rock’s landing in Cashel. Cashel is reputed to be the site of the conversion of the King of Munster by St Patrick in the 5th century.
The Rock of Cashel was the traditional seat of the kings of Munster for several hundred years prior to the Norman invasion. In 1101, the King of Munster, Muirchertach Ua Briain, donated his fortress on the Rock to the Church. The picturesque complex has a character of its own and is one of the most remarkable collections of Celtic art and medieval architecture to be found anywhere in Europe. Few remnants of the early structures survive.The majority of buildings on the current site date from the 12th and 13th centuries.