Ivanhoe, the King's Knight

Ivanhoe, the King's Knight was a 1997 French animated TV series about the heroic 12th century English knight Ivanhoe, who protects his fellow countrymen in the name of King Richard. The series is loosely based on the Sir Walter Scott novel Ivanhoe, published in 1820.

The Assassin and the Potion (Season 1, Episode 6)
Rowena, Ivanhoe's love interest, is drugged and hypnotized into trying to kill Ivanhoe, and is later hypnotized into marrying Prince John.