In the great plot of Ferdinand, King of Aragon, to shut France in by a close ring of rivals, and so to stay her march eastward along the Mediterranean to the detriment of the little realm of his fathers, the first open move was made by the triumphant negotiations with Maximilian, King of the Romans, and future Emperor, for the marriage of Ferdinand's only son, John, the first heir of all Spain, to Maximilian's only daughter, Margaret; and that of Maximilian's only son, Philip, sovereign by right of his mother of the rich duchies of Burgundy, to Ferdinand's second daughter, Joanna. The matches were cleverly conceived, for in the ordinary course of events they seemed to ensure that a band of close kinsmen, all descended from the King of Aragon, should rule over Flanders, the Franche Comté, Burgundy, the Empire, Spain, and Sicily, all banded together to prevent the expansion of France on any side, whilst the alliance which the marriages represented gave to Ferdinand the support of the Emperor as suzerain of Lombardy against the French pretensions in Italy generally, and especially in Naples, upon which the covetous eyes of the Aragonese were already firmly fixed. The marriage of Ferdinand's youngest daughter, Katharine, to the heir of England, at a somewhat later period, was another link in the chain which was intended to bind France, and give to Ferdinand a free hand in the Mediterranean. To Maximilian the marriages of his children with those of Ferdinand was also an advantage, since the only two enemies that the Empire and Burgundy had to fear, namely, France and the Turk, might always be diverted, when necessary, by the action of Aragon in the Mediterranean. Henry Tudor's interest in joining the combination against France is equally easy of explanation. He was a parvenu, anxious for the recognition of the legitimate sovereigns; and especially to secure that of Burgundy, which, under the influence of Margaret of York, the widowed Duchess of Burgundy, had hitherto supported and sheltered the pretenders to his throne. But from the very first each of the three clever players distrusted the others because he knew that he himself intended to cheat if he could, and throughout the whole series of transactions sharp practice is the gentlest term that can be applied to the action of the high contracting parties.