In 1170 King Henry III had a stone castle built on the same elevated site.
Nottingham Castle was established as the most important and formidable royal castle in the Midlands.
In 1330 King Edward III broke into the castle through a 300ft long subterranean passageway.
Edward surprised his mother, Queen Isabella, and Roger Mortimer, Earl of March.
The passageway is known as Mortimer's Hole.