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In page Joanna of Aragon, Countess of Empúries:

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Many members of her family showed dislike to her father's fourth wife Queen Sibila, due to her low ranking birth and her family's interference at court. Joanna's husband John came into conflict with Sibila, and then rebelled against Joanna's father.[citation needed] The marriage of Peter and Sibila also led to a strain between himself and his three surviving children: Joanna, John and Martin.[1]