For over 100 years the Citadel was the most important English defence against attack from the sea and it remains one of Europe's finest 17th Century fortifications.
The Citadel was built on the orders of King Charles II in 1665 as a defence against a threatened Dutch invasion and has been in continuous use ever since.
Believing the Navy 'vital to the safety, honour and welfare of the realm', the King was determined to protect Plymouth's military and commercial harbour.


