The Son of Robin Hood

The Son of Robin Hood is a 1958 adventure DeLuxe color CinemaScope film directed by George Sherman, starring David Hedison and June Laverick. The son of the legendary Robin Hood helps save his countrymen from the tyrannical rule of an evil aristocrat. Unfortunately, the son is a sham and after several unsuccessful attempts to stop the nasty nobleman, the merry men decide to send for Robins real son. Imagine their surprise when they discover that Robin Jr. is a she Still the men rally around her and the imposter. Together they defeat the evildoer and the country is again safe.

Source: Wikipedia