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In page Maria Pia de Saxe-Coburgo e Bragança:

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Carlos I was a constitutional monarch. He did not claim autocratic power, but instead ruled according to the Constitutional Charter of 1826 which stated that the succession to the throne passed only to legitimate descendants. The Constitution, including all matters of succession, could only be amended by the Cortes. Even if Carlos had signed a document granting succession rights to Maria Pia, it would have had no legal value at all.[citation needed]