Princess Knight is a tV series anime that premiered in spring 1967, produced by Mushi Production.

About the production: the story comes from a manga, there are 52 episodes of about 23 minutes and its current status is "finished".

Its main genres are action, fantasy, mystery and romance, with themes such as Female Protagonist, Foreign, Shoujo and Fairy Tale.

On AniList, Princess Knight has an average score of 64%, an average score, and appears on 2,912 users' lists.

The franchise continues in or follows from: Ribbon no Kishi Pilot.

Princess Sapphire is a girl raised as a Prince. Through the mischief of an angel, the princess is born with both a girl's body and boy's mind. Since there is no boy successor in her kingdom, Sapphire is raised as a boy, but evil ministers try to reveal her secret. Unable to put up with the kind of vicious conduct prevailing in the kingdom, Sapphire disguises herself as "Princess Knight" and wields her sword of justice. This is an animated version of the girls' manga featuring Sapphire's romance and adventure, which marked the first made-for-TV animated program geared towards girls in Japan. (Source: Official site)

Official synopsis from AniList.