Princess Knight, released in Japan as Ribon no Kishi, is a Japanese manga series written and illustrated by Osamu Tezuka. This manga follows the adventures of Princess Sapphire, a girl who pretends to be a male prince to prevent the criminal Duke Duralumin from inheriting the throne of the reign of Silverland.It was originally serialized in Kodansha's Shōjo Club from 1953 to 1956, with chapters collected and release into two tankōbon volumes.