Role During the Owain Glyndŵr Rebellion

In the early 15th century, the Owain Glyndŵr uprising posed a serious challenge to English rule. Beaumaris Castle remained a stronghold for the English but faced repeated sieges and threats.

The castle’s robust defenses helped it withstand attacks, although the wider region suffered devastation.

Decline in Military Importance

As the medieval period progressed, changes in warfare, such as the introduction of gunpowder artillery, rendered traditional castles less effective.

Beaumaris gradually lost its strategic significance and was maintained more as a symbol of English authority than an active fortress.

 The English Civil War and Aftermath

Use During the Civil War

During the English Civil War (1642–1651), Beaumaris Castle was held by Royalist forces but was captured by Parliamentarians in 1646.

The castle’s military value was limited, and after the war, it was partially dismantled (slighted) to prevent its future use.

Post-War Period

In the following centuries, the castle fell into ruin. Locals scavenged stone for building materials, and the site became overgrown. shutdown123