Hippolyte (Hippolyta) in Heracles (Hercules): The Twelve Labors
Hippolyte was the Queen of the Amazons, a race of warrior women. As his ninth labor, Heracles has to fetch her belt. According to some, Hippolyte is totally cool about it, but then Hera disguises herself as an Amazon and rallies them against Heracles. Heracles gets away with the belt, but kills Hippolyte, thinking she has betrayed him.