Maria Pia of Braganza also claimed that in the archives of the Diocese of Madrid-Alcalá there was a copy of a document signed by King Carlos March 14, 1907 in which he recognised Maria Pia of Braganza as his daughter and that "she may be called by my name and enjoy from now on the use of this name with the honours, prerogatives, rank, obligations and advantages of the princes of the House of Braganza of Portugal".