Deganwy Castle was an early stronghold of Gwynedd and lies in Deganwy at the mouth of the River Conwy in Conwy, north Wales.
The Early Middle Ages fortress, which is now little more than ditches and mounds, was made of wood and constructed on a massive rock outcrop in what is now the suburbs of modern-day Llandudno. Traditionally, it was the headquarters of Maelgwn Gwynedd, King of Gwynedd (fl. c. 520–547). A nearby hill is called Bryn Maelgwyn and other places in the locality are associated with him. An important coin hoard of 204 Silver Cnut pennies was found on Bryn Maelgwyn in July 1979.
Deganwy was probably first occupied during the Roman period, but was popular in the years following their departure because it was safe from Irish raids. The area beneath the rocky stronghold may have been the site of a settlement of serfs. The stronghold was burned down in 812 when it was struck by lightning.
By the thirteenth century, Deganwy was fortified by the prince of Wales Llywelyn ab Iorwerth. It was captured by the earl of Chester in 1210, but recaptured shortly afterward by Llywelyn, who had it refortified in stone.
In 1241, possession of the castle was taken by King Henry III of England, who embarked on an extensive building programme. The castle was destroyed by Llywelyn ap Gruffudd, Prince of Wales in 1263. In 1283, King Edward I of England had Conwy Castle constructed just across the estuary and he left Deganwy Castle in ruins.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.