<sod>The castle also played a part in the [[English Civil War]] when it changed hands several times and was besieged in 1645 by [[Roundhead|parliamentary troops]]. It was later blown up by gunpowder to make it indefensible and was never repaired.<ref name=CoW/><eod>
<sod>Newcastle Emlyn Castle was captured by the Welsh in 1403 as part of the [[Glyndŵr Rising]]. The building were repaired in the 15th century, and was documented as being in good condition in the early 17th century.<ref name=Parry11>{{cite journal |first=Charles |last=Parry |title=Survey and excavation at Newcastle Emlyn Castle |journal=The Carmarthenshire Antiquary |year=1987 |volume=23 |page=11}}</ref> The castle also played a part in the [[English Civil War]] when it changed hands several times and was besieged in 1645 by [[Roundhead|parliamentary troops]].<ref name=CoW/> A document from around 1700 noted that the castle had been "dismantled in the late Civill warres and plundered and ever since neglected".<ref>{{cite journal |first=Charles |last=Parry |title=Survey and excavation at Newcastle Emlyn Castle |journal=The Carmarthenshire Antiquary |year=1987 |volume=23 |page=25}}</ref> While the history of the castle has gained attention from historians, the first accurate plan of the site was not produced until 1985.<ref name=Parry11/><eod>