High Quality Content by WIKIPEDIA articles! 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 (1415 - 14 May 1462) 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.