Aberystwyth Castle was built in response to the First Welsh War in the late 13th century, replacing an earlier Motte and bailey castle located a mile to the south. The current castle was rebuilt in its current location by Edward I of England in 1277 after the end of the first war against Llywelyn ap Gruffydd Llywelyn the Great's grandson. The Welsh took the castle in 1282 at the start of the 1282 war and burned both the castle and the town. Under master mason James of St George, the castle was eventually completed in 1289, though it was sieged extensively during the revolt of Madog ap Llywelyn in 1294–5.
During a national uprising by Owain Glyndŵr, the Welsh captured the castle in 1404, but it was recaptured by the English four years later. In 1637 it became a Royal mint by Charles I, and produced silver shillings. The castle was slighted by Oliver Cromwell in 1649.
References:The Broch of Clickimin is a large and well preserved, though somewhat restored broch near Lerwick. Originally built on an island in Clickimin Loch (now increased in size by silting and drainage), it was approached by a stone causeway. The water-level in the loch was reduced in 1874, leaving the broch high and dry. The broch is situated within a walled enclosure and, unusually for brochs, features a large 'blockhouse' between the opening in the enclosure and the broch itself. Another unusual feature is a stone slab featuring sculptured footprints, located in the causeway which approached the site. Situated across the loch is the Clickimin Leisure Centre.