The Duke of Lucca (Charles II, Duke of Parma) was not only proposed as an Argentine monarch but the idea was to propose a marriage between him and one of the Brazilian princesses, whose dowry would include Cisplatina, then a Brazilian province. The United Provinces was at war with the Empire of Brazil over Cisplatina. The plan (both the Duke of Lucca and the marriage to a Brazilian princess) which had been approved by the United Provinces' parliament, came to nothing after the king of Spain - once again - refused to allow any member of his family as a monarch in one of his former colonies.