John of Luxembourg, Lord of Beauvoir
John of Luxembourg ("Jean de Luxembourg") ( – bef. 2 July 1397, Italy), was Lord of Beauvoir (or Beaurevoir) and Richebourg, and also (as "John II") Count of Brienne and Conversano (). He was a member of the French branch of the House of Luxembourg, the son of Guy I of Luxembourg, Count of Ligny and Mahaut de Châtillon (1335–1378), Countess of Saint-Pol. John married around 1387 with Margaret, Countess of Brienne, daughter of Louis of Enghien, heiress of the counties of Brienne and of Conversano, and the Lordship of Enghien. They had five children: John