King Johns Castle or popular known as Carlingford Castle was initially built by Hugh DeLacy, but there is evidence it was perched on the rock long before DeLacys men put the hammer to stone. The site got its name from Englands King John. King John (famous from Robin Hoods classics) invaded Ireland and met his nemesis Walter DeLacy where he fought him for ownership of Irelands East. There is no evidence that King John stayed in Carlingford but it often rumoured he did. So, in quintessential Irish fashion, the title King John’s Castle seems to have been applied to the Castle either sarcastically or claim to fame.