King John’s Castle is located at the heart of Limerick’s medieval quarter, step inside the walls of this iconic landmark! Discover the stories of ruthless King John, the noble knights, and rebellious natives. King John's Castle brings to life over 800 years of dramatic local history. After a tour of the castle why not stop in to Treaty City Brewery in the heart of Limerick’s Medieval Quarter, experience a unique and authentic experience that pays homage to the art of craft brewing that has been much loved throughout the centuries. is the former seat of the Kings of Munster. The Rock of Cashel was handed over to the church in 1101 and became the seat of the Archbishop. Today, five buildings remain, including an impressive round tower, 12th century chapel, 13th century cathedral, and the Hall of the Vicar's Choral.