Rectangular Iron Age hill fort covering 16¼ acres and defended by a ditch with the entrances at the north west and south east sides.
Roman fort covering 22 acres with entrances at the east and north west corner.
Had two main building phases.
Finds include bones.
400 BC dating from: Basic defences included a ditch and rampart with timber lacing rear and front.
1st C BC First half: The silted ditch was re-cut and the rampart renewed.
54 BC Possible site where Cassivellanaus was defeated by Caesar.
2012 Excavated – Ravensburgh Castle Project.
Archaeological Report available here – https://northhertsmuseum.org/wp-content/uploads/2020/05/Ravensburgh-Castle-Project-report-No-3-2018.pdf