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In page Infanta Isabel Fernanda of Spain:

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Isabel Fernanda was born an infanta of Spain as a daughter of Infante Francisco de Paula and Princess Luisa Carlotta of the Two Sicilies. Once King Ferdinand VII of Spain died in 1833, his wife, Queen Maria Christina, the younger sister of Isabel’s mother Luisa, married discreetly to Agustín Fernando Muñoz y Sánchez—the reason behind the discreet behaviour of the marriage was due to the fact it was morganatic.[1][2] The marriage, once it was known, caused a great rift between Maria Christina and her sister Luisa Carlotta; expressed by the queen sending Luisa and her family abroad to Paris.[citation needed] Isabel was educated in a schoolhouse, in Paris.