The Rock of Cashel, also known as Cashel of the Kings or St. Patrick's Rock, is a historic site located in Cashel, County Tipperary, Ireland. It is a complex of medieval buildings that sit atop a rocky outcrop, including a 12th-century round tower, a 13th-century Gothic cathedral, a 15th-century castle, and a number of other structures.

According to legend, the site was the seat of the kings of Munster for hundreds of years before the arrival of the Normans in the 12th century. It became an important religious center after the conversion of the Irish to Christianity in the 5th century, and it is said that St. Patrick himself visited the site in the 5th century.

The Round Tower, which is over 28 meters tall, was built in the 12th century and served as a bell tower and a refuge for the monks during times of attack. The cathedral was built in the 13th century and features beautiful Gothic architecture, including intricate carvings and stained glass windows.

The castle was added to the site in the 15th century by the Archbishop of Cashel, who was also Lord Chancellor of Ireland. It was used as a residence until the 17th century, after which it fell into disrepair.

Today, the Rock of Cashel is one of the most visited tourist sites in Ireland, attracting thousands of visitors every year. It is also an important symbol of Ireland's rich cultural heritage and is often used as a backdrop for cultural events, including music and theatrical performances.