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In page Maria Pia of Savoy:

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Maria Pia and Antónia both disliked each other. This hatred grew to the point where Antónia would refer to the penultimate queen of Portugal as 'x' in her letters to Luís.[citation needed] Antónia strongly believed that Maria Pia was having an affair and urged Luís to pursue a divorce, which was quite a double-standard as she was well aware of Luís' affairs.[citation needed] Maria Pia also maintained a rocky relationship with her father-in-law Ferdinand II of Portugal, disapproving of his morganatic marriage to an opera singer.[citation needed]