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| Odiham (King John’s) Castle | |
|---|---|
| North Warnborough, Hampshire, England | |
 Ruins of Odiham (King John’s) Castle. | |
| Type | Shell keep with outer bailey |
| Height | Up to 9 metres (30 ft) |
| Site information | |
| Owner | Hampshire County Council |
| Open to the public | Yes |
| Condition | Ruin |
| Site history | |
| Built | 1207–1214 |
| Built by | King John |
| In use | Until mid 16th century |
| Materials | Flint Lime mortar Timber |
| Battles/wars | First Barons' War |
| Events | Hosted Parliament in the 13th century Prison of Scottish King David II |
Odiham Castle (also known locally as King John's Castle) is a ruined castle situated near Odiham in Hampshire, United Kingdom.
It is one of only three fortresses built by King John during his reign. The site was possibly chosen by King John because he had visited the area in 1204 and it lay halfway between Windsor and Winchester.