By the 14th and 15th centuries, the military importance of Kidwelly Castle declined somewhat as warfare evolved. However, it remained an important administrative center.

The Glyndŵr Rebellion

In the early 15th century, Owain Glyndŵr led a major Welsh revolt against English rule. Kidwelly Castle was targeted during this rebellion but was never fully captured. The castle’s defenses and garrison successfully withstood attacks, symbolizing English strength.

Later Use and Decline

Following the Glyndŵr rebellion, the castle's military role diminished further. It was maintained as a residence for local officials and nobles, but no significant military engagements occurred there.

By the 16th century, many Welsh castles fell into ruin as centralized English authority grew stronger and artillery made traditional castles less effective.

Modern Era and Preservation

In the centuries following its decline, Kidwelly Castle suffered neglect and partial ruin. However, its impressive remains attracted antiquarians and historians from the 18th century onward.

Conservation and Tourism

In the 20th century, the castle became a protected historic monument. Today, it is maintained by Cadw, the Welsh government’s historic environment service, which preserves and promotes Welsh heritage.

The castle is open to the public and remains one of the most visited medieval castles in Wales. Its dramatic ruins provide insight into medieval military architecture and Welsh history. shutdown123