Conwy has been involved in military conflict for over 2,000 years. The Iron Age hill fort of Caer Seion defended the area from the sixth century BC. Many slingshot stones have been discovered here, attesting to troubled times. In 881 the Welsh defeated an Anglo-Saxon army led by Aethelred of Mercia. The most spectacular outcome of Conwy's strategic military significance at the mouth of the River Conwy was Edward I's mighty castle, creating a walled...