Diana Capilet is a young lady of Florence, the daughter of the Widow innkeeper.
She is being forcefully wooed by Bertram, and is not entirely indifferent to him. She is touched by Helena’s story and agrees to her plot to trick Bertram in to sleeping with her. She allows Bertram to seduce her and quickly convinces him to exchange his ancestral ring for her chastity. The experience disgusts her enough that she vows to never marry. She has the backbone to walk into the French court and accuse Bertram of dishonoring her before the King himself, not to mention speaking in riddles that put her in danger of jail to produce the most dramatic entrance possible for Helena. The King offers her a choice of lords for a husband if she so chooses.