Hurry up! Black Cloud Island
Duke Duralumon sends five assassins after the royal family and the Phantom Knight in an attempt to do away with them permanently. Source: crunchyroll
Aired 01/10/1967EP 27 - Hurry up! Black Cloud Island
Princess Knight
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)