John II of Luxembourg, Count of Ligny was a French nobleman and soldier, a younger son of John of Luxembourg, Lord of Beauvoir, and Marguerite of Enghien. His older brother Peter received his mother's fiefs, including the County of Brienne, while John received Beaurevoir. He married Jeanne de Béthune, Viscountess of Meaux, widow of Robert of Bar, on 23 November 1418, and became step-father to Jeanne de Bar, Countess of Marle and Soissons. He and Jeanne de Béthune had no children.

Jeanne de Bar, suo jure Countess of Marle and Soissons, Dame d'Oisy, Viscountess of Meaux, and Countess of Saint-Pol, of Brienne, de Ligny, and Conversano was a noble French heiress and Sovereign Countess. She was the only child of Robert of Bar, Count of Marle and Soissons, Sire d'Oisy, who was killed at the Battle of Agincourt when she was a baby, leaving her the sole heiress to his titles and estates. In 1430, at the age of fifteen, Jeanne was one of the three women placed in charge of Joan of Arc when the latter was a prisoner in the castle of John II of Luxembourg, Count of Ligny, Jeanne's stepfather.