killuaxx's Favorite

Spoiler
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Grand Duchess is the reason why Grand Duke and Iris' mother did not get together. The Duke does not know this, but will find out later. The Duchess is selfish and wanted him to marry her and threatened to harm Iris' mother. Iris's mother may have been pregnant by this time. After all, Iris's mother was attacked and Anikin's father had saved her. That is why Iris's mother withdrew.
Grand Duchess also clings to Nera because she believes that this is how she gets attention and love from the Grand Duke. Which is why she also helps Nera and tries to harm Iris. There is a big event where he is also spoken to about this and it becomes clear in front of everyone that Grand Duchess means nothing to him. She thought she was the one and only and has divided him and Iris' mother.
Grand Duke becomes very angry when he learns the truth and she gets what she deserves.