Amidst infinite chicanery and baseness on both sides the marriage treaty of Isabel’s youngest daughter, Katharine, with Arthur, Prince of Wales, had been alternately confirmed and relaxed, as suited Ferdinand’s interests. But he took care that it could be at any time revived when need should demand it. This made Ferdinand always able to deal a diverting blow upon France in the Channel. But Ferdinand’s main stroke of policy was the double marriage of his children, Juan, Prince of Asturias, with the Archduchess Margaret, daughter of Maximilian, sovereign of the Holy Roman Empire; and of Joan, Isabel’s second daughter, with Philip, Maximilian’s son, and, by right of his mother, sovereign of the dominions of the Dukes of Burgundy with Holland and Flanders; whilst Isabel’s eldest daughter, already the widow of the Portuguese prince, Alfonso, was betrothed to his cousin, King Emmanuel. Imagination is dazzled at the prospect opened out by these marriages. The children of Philip and Joan would hold the fine harbours of Flanders, and would hem in France by the possession of Artois, Burgundy, Luxembourg, and the Franche Comté; whilst their possession of the imperial crown and the German dominions of the house of Habsburg would identify their interests with those of Ferdinand in checking the French advance towards Italy. On the other side of the Channel the grandchildren of Ferdinand and Isabel would rule England, and hold the narrow sea; whilst the friendship between England and Scotland, prompted by Ferdinand, and the marriage of Margaret Tudor with James IV., deprived France of her ancient northern ally. The King of Aragon might then, with the assurance of success, extend his grasp from Sicily to the East, and become the master of the world. The plan was a splendid one; and for a time it went merry as the marriage bells that heralded it. With his family seated on the Portuguese throne, Ferdinand had, moreover, no attack to fear on that side from French intrigue, such as had often been attempted; and for a brief period it seemed as if all heaven had smiled upon the astute King of Aragon.