John More, on a visit to London, falls in love with the King's daughter. The King declares he will kill John, and takes him prisoner by drugging him. John sends a message begging help. Two giants come to rescue him, browbeating the King into surrender
Child views this as "perhaps an imitation, and in fact almost a parody, of 'Johnie Scot.'" Certainly the plots are very much alike -- but the supernatural feats of the rescuers are commonplaces (cf., e.g., "Hughie Grame" [Child 191]).
The surname "More/Moore" appears a distortion of Gaelic "Mor," "big." - RBW