As early as April 1470,
Charles the Bold, Duke of Burgundy, proposed a marriage between his daughter and sole heiress (
Mary of Burgundy) to Prince Frederick, heir to the throne of Naples, to cement an alliance between Burgundy and Naples. The plans took shape in November 1471, after the signing of an alliance between Charles and
King Ferdinand of Naples. As one of the richest heiresses of her time, Mary of Burgundy had many nobles attempting to marry her. The suitors included princes and lords such as
Ferdinand the Catholic,
Duke Nicholas I of Lorraine,
Philibert of Savoy,
George of England, and
Charles de Guyenne. Louis XI himself expressed interest in nominating a prince of
Aragon or
Naples, with whom he could exchange the claims of
Anjou against the Burgundian territories he sought to inherit in Maine. In February 1472, King Ferdinand received Frederick with the aim to aid in the project, a Burgundian delegation insisted that Charles the Bold, for its part, had not stopped his choice. Frederick's sister
Eleanor expressed confidence in the idea that the Duke of Burgundy sought to join in alliance before Easter. But these hopes were shattered during the summer when they learned, at the court of Naples, of the engagement of Mary of Burgundy to Nicholas of Lorraine, a claimant to the Kingdoms of Naples and Aragon, resulting from the alliance concluded between Charles, Duke of Burgundy and Nicholas, Duke of Lorraine on 25 May 1472, and signed by Nicholas, in turn, on 27 May 1472. Mary gave her consent to the promise of marriage on 13 June 1472, and Nicolas sent her his "Mons-en-Hainaut" the same day. In October 1472, a new Burgundian embassy arrived at Naples reassuring about the arrangement of Mary of Burgundy and the relationship between Charles the Bold and the King of Naples. On leaving, they left behind two squires responsible for teaching Frederick better French. Charles the Bold used the eventual marriage of his daughter as an instrument of his diplomacy. The engagement of Mary and Nicholas never came to fruition. On 5 November 1472, at the camp of Charles the Bold in Beaurevoir, Nicholas waived his promise of marriage without jeopardizing the alliance between the two dukes. Mary renounced her betrothal on 3 December. In 1473, due to both sides failing to meet the commitments of the alliance, along with the rumor of Charles's reckless plan to marry his daughter to
Maximilian, the son of
Emperor Frederick III, King Ferdinand began exploring the possibility of a union between Frederick and
Joanna, daughter of
John II of Aragon. He also raised the possibility of a marriage with a daughter of Luca Sanseverino, Prince of Bisignano, before returning to his original wedding arrangements. ==At the court of Charles the Bold==