The ruins of century King John's Castle near Odiham, Hampshire The 'Castle' was actually a fortified octagonal hunting lodge, surrounded by moats. King John rode from here to sign Magna Carta at Runnymede. King John generation 28 on family tree.
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. It was built from 1207 to 1214.