Princess Knight (Choppy & the Princess) was known as 'Ribbon No Kishi' in Japan and was based on the Manga publication of 1953-56. 52 episodes were made, it was created and produced by Osamu Tezuka and his own company Mushi Productions, airing on Japanese TV in 1967-1968.
Princess Knight was a beautifully designed color series about a young princess in a fairy tale kingdom who must pretend to be a male for political reasons. The series was set in Medieval times. Princess Sapphire masqueraded as a boy and was called Prince Knight (since a girl could not take over the throne). She had a little assistant ‘Choppy' who was an angel and always blew a trumpet.
At night she would wear a Robin-style (from Batman & Robin) mask and was known as the Phantom Knight, who fought evil. In the first episode the King announces the birth of his child as a Prince who will someday be King. He deceives the people since a girl cannot succeed to the throne according to the law of the land. The lie is to stop the evil 'Duke Duralumon' from getting his hands on the throne as he is next in line. The only other people that knew the truth were the Doctor, Gary and the Nurse.
The whole series is based around Duralumon trying to prove that the Prince is really a girl.
Princess Knight was actually born with 2 hearts. Choppy was an angel who gave the Princess a blue heart before the Head Angel gave her a pink one to be a girl; so choppy was sent from heaven to get the blue heart back from her to make her into a nice little girl. Choppy had been looking for her for 12 years and when he finds her the adventure begins.
Princess Knight was actually bought and dubbed by Joe Oriolo.
In 1969, 52 episodes were purchased from Japan, scripts written, lines dubbed. Unfortunately, the business arrangement between Joe Oriolo and his then partner, Burt Hecht, fell apart, and as part of the settlement, the partner departed with the Princess Knight masters never to be heard from again. Somehow some copies ended up in Australia and "Princess Knight" was shown on TV, first on September 1970. The show was also dubbed in Spanish and shown in Spain in the 80's.