Jeanne of Bar, Countess of Marle and Soissons

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.

On 16 July 1435, at the age of twenty, Jeanne married Louis of Luxembourg, Count of Saint-Pol, Brienne, de Ligny, and Conversano, Constable of France (1418 – 19 December 1475).

Louis was the eldest son of Peter of Luxembourg, Count of Saint-Pol, Brienne, and Conversano, by his wife Margaret de Baux.

Louis had been brought up by his paternal uncle, who was Jeanne's stepfather, John II of Luxembourg, Count of Ligny and Guise; therefore the young couple were well-acquainted with one another.

The title and estates of Guise were given to Louis' youngest sister, Isabelle as her dowry, which passed to her husband, Charles, Count of Maine, upon their marriage in 1443.

Louis of Luxembourg, Count of Saint-Pol, of Brienne, de Ligny, and Conversano, Constable of France , was the husband of Jeanne de Bar