Nottingham Castle was founded around 1068, traditionally under William Peverel, on a sandstone height overlooking the River Trent approaches. The Norman stronghold controlled a major town and routes through the Midlands. Timber defenses gave way to stone walls, towers, halls, chapels, and royal apartments. Caves cut into the rock supported storage, movement, and service functions. Because the castle belonged to the Crown for much of the Middle Ages, sheriffs, soldiers, servants, officials, and visiting monarchs made it a center of regional government as well as a military fortress.

The castle figured repeatedly in struggles for the English throne. Supporters of Prince John held it while Richard I was on crusade; Richard recovered Nottingham after a siege in 1194. In 1330 the young Edward III and companions entered through a passage in the rock and arrested Roger Mortimer, who had dominated government with Queen Isabella. Later kings improved the residence, and Richard III used Nottingham as a base before marching to Bosworth in 1485. These episodes made the castle a stage for both royal authority and rebellion.

By the seventeenth century parts of the medieval complex were decayed, yet the site retained enormous symbolic value. Charles I raised his standard at Nottingham in August 1642, conventionally marking the beginning of the English Civil War. Parliament soon controlled the castle and strengthened it as a garrison. After the war, the surviving medieval defenses were demolished in 1651 to prevent future military use. The deliberate destruction left earthworks, caves, fragments, and the gatehouse but erased the dense royal buildings that had occupied the summit.

William Cavendish, first duke of Newcastle, built a palatial mansion on the site in the 1670s. The residence represented aristocratic restoration after civil conflict rather than a reconstruction of the castle. During national unrest over parliamentary reform in 1831, rioters attacked and burned the mansion because its owner opposed the Reform Bill. The gutted shell stood for decades before Nottingham acquired it. In 1878 it reopened as one of Britain's early municipal art museums, joining civic education to a landscape already heavy with political meaning.

Later redevelopment, archaeological research, and conservation have repeatedly reshaped the site. The surviving medieval gatehouse, rock-cut caves, traces of walls, ducal mansion, and museum collections require interpretation as distinct but connected layers. Nottingham Castle's popular association with Robin Hood adds another form of memory, although the legendary outlaw cannot be tied to a documented event at the site. The hill records a longer sequence: Norman conquest, royal power, Mortimer's fall, Richard III's final campaign, civil war, deliberate slighting, aristocratic rebuilding, reform-era violence, and municipal heritage.