Viewed from the Italian states, the death of the Duke of Burgundy in 1477 and the resultant downfall of his duchy as a threat to the French throne signalled vast changes in the states' relationships with the kingdom of France. his connection by marriage to the royal house of Savoy, Louis XI continuously courted a strong relationship with Francesco I Sforza, the Duke of Milan, who was a traditional enemy of Savoy. As a confirmation of the close relationship between Milan and the king of France, Sforza sent his son Galeazzo Maria Sforza to aid Louis XI in his war against the League of Public Weal in 1465 at the head of a large army. Later, differences arose between France and Milan that caused Milan to seek ways of separating itself from dependence on the French. However, with the downfall of Burgundy in 1477, France was seen in a new light by Milan, which now hurriedly repaired its relationship with Louis XI. Likewise, France's old enemy King Ferdinand I of Naples began to seek a marriage alliance between the Kingdom of Naples and France. Louis XI also opened new friendly relations with the Papal States, forgetting the past devotion of the popes for the Duke of Burgundy. In January 1478, he signed a favorable treaty with the Republic of Venice.