Lismore lies in the Blackwater valley, at the southern foot of the Knockmealdown Mountains. A monastery was founded here by St. Cartagh in 633. In the 9th and 10th centuries it was plundered by the Norsemen. Lismore Castle was erected by Prince John (later king of England) in 1185.
Just down from the Cathedral is Lismore Castle - built in 1185 by Prince John on the site originally occupied by Lismore Abbey, a monastery and important seat of learning established in the early 7th century. It remains the home of the Duke of Devonshire.
This is Saint Carthage's Cathedral, which I'm lucky enough to live next door to. The original Cathedral burned down in the 17th century, but was reconstructed in 1663. It's surrounded by a immaculate cemetery grounds that are serene to walk through.