Question: When was John Of Luxembourg, Count Of Soissons's mother born?
Sentence (from "Jeanne of Bar, Countess of Marle and Soissons"): 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.
Relevant evidence: Yes