John III (died before 8 October 1286), son of John II, Count of Soissons,[1] and Marie de Chimay. Count of Soissons and Seigneur of Chimay. John inherited the countship of Soissons upon his father’s death in 1272.
John married Marguerite de Montfort, daughter of Amaury, Count of Montfort, and his wife Beatrix de Viennois.[2] John and Marguerite had: