It invested in the Spanish railways, which earned him the citation of the Order of Isabella.
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He represented the Cuban Government at the wedding of King Alfonso XIII of Spain and was conferred the Order of Isabella the Catholic.
He was friendly with the Bonaparte royal family in France, and was awarded the honor of Knight Commander of the Royal Order of Isabella the Catholic, by the King of Spain in 1871, which gave him the title of "Chevalier".
Marx was made a Knight-commander in the Order of Isabella the Catholic by the Spanish government for his re-enactment in the Niña II of Christopher Columbus' first voyage of exploration.