'''Louis de Luxembourg, Count of Saint-Pol, of Brienne, de Ligny, and Conversano''' (1418 – 19 December 1475) belonged to the Ligny branch of the House of Luxemburg+ and was Constable of France+.Richard Vaughan, ''Charles the Bold'', (Boydell Press, 2002) 250-251.
After this, he was persistently disloyal to the King, conspiring with Charles, Count of Charolais, and with Edward IV of England+, his nephew by marriage. The final treason came in 1474 when Saint-Pol approached Charles the Bold+, Duke of Burgundy+, who had already entered into a compact with Edward IV of England to dismember France in a renewal of the Hundred Years' War. The scheme envisaged the murder of Louis and the sub-division of France between Saint-Pol, the Dukes of Burgundy, Brittany, Bourbon and Namours, the Count of Maine+ and King Edward. Saint-Pol then proceeded to draw other magnates into the conspiracy.
The whole thing started to unravel after Louis and Edward concluded the Treaty of Picquigny+ in August 1475. Angered by this, Saint-Pol was imprudent enough to write to Edward, upbraiding him as a "cowardly, dishonoured and beggarly king". Edward promptly forwarded the letter to Louis, who now had all the proof he needed. A messenger was sent to the conspirator, in which he was informed that the King had 'need of a head such as his.' He was arrested in September 1475, and later imprisoned in the Bastille+. Execution followed in December. Philippe de Commynes+, the chief chronicler of Louis' reign, was to write that Saint-Pol had been "abandoned by God because he had tried with all his might to prolong the hostilities between the King and the Duke of Burgunday."
*The Memoirs of Philippe de Commines+ are a major source on the life of Louis de Luxembourg, Count of Saint-Pol.
Louis de Luxembourg, Count of Saint-Pol+ Louis de Luxembourg, Count of Saint-Pol, of Brienne, de Ligny, and Conversano (1418 – 19 December 1475) belonged to the Ligny branch of the House of Luxemburg and was Constable of France.