4.-When were they built?

Cardiff Castle- The castle was built over 2000 years ago.
Raglan Castle- The castle was built in 1100.
Caerphilly Castle- The castle was built in 1271.
Chepstow Castle- It was begun in 1067, a year after the Battle of Hastings. Chepstow was heavily modified and added yoo during the 12th century, and the 13th century saw mostly domestic work being carried out.
Castle Coch- The castle was built in 1891.