Carlisle Castle built
1093 CE.
Shown on the map at 54.897°, -2.942°.
Carlisle Castle is a medieval stone fortress located in the city of Carlisle, Cumbria, near the site of Hadrian's Wall and the Roman fortress of Luguvalium. The castle was first built during the reign of William II in 1092 and rebuilt in stone under Henry I in 1122. It played an important role in the Wars of Scottish Independence in the later Middle Ages, being besieged several times. During the Jacobite Rising of 1745–1746, Carlisle became the last English fortress to undergo a siege. The castle was listed as a Scheduled Ancient Monument on 7 August 1996. Today the property is managed by English Heritage and is open to the public. Until 2006, the castle was the administrative headquarters of the former King's Own Royal Border Regiment and until 2019 it was the county headquarters to the Duke of Lancaster's Regiment. A museum to the regiment is within the castle walls.
Text from the Wikipedia article Carlisle Castle, licensed CC BY-SA 4.0.