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Alfonso de Borbón and his cousin María de las Mercedes de Orleans fall in love and, although both families do not maintain good relationships, young people marry when Alfonso became king of Spain.
After the death of Queen Mercedes, Alfonso XII's first wife, the problem of the succession is raised. The monarchy needs a heir and the King choses María Cristina from Habsburd to be the futur spanish queen. But Mercedes memories will be against the marriage and the long-awaited son will born when Alfonso is already dead.
