Joan of Bar was niece to a a King of England but in which year did he gain this title?
Edward II of England Edward II (25 April 1284 – 21 September 1327), also called Edward of Caernarfon, was King of England from 1307 until he was deposed in January 1327. The fourth son of Edward I, Edward became the heir to the throne following the death of his older brother Alphonso. Beginning in 1300, Edward accompanied his father on campaigns to pacify Scotland, and in 1306 he was knighted in a grand ceremony at Westminster Abbey. Edward succeeded to the throne in 1307, following his father's death. In 1308, he married Isabella of France, the daughter of the powerful King Philip IV, as part of a long-running effort to resolve the tensions between the English and French crowns.
Marie I de Coucy, Countess of Soissons Marie I de Coucy, Dame de Coucy and d'Oisy, Countess of Soissons (April 1366 – after 3 March 1405) was the wife of Henry of Bar, and the granddaughter of King Edward III of England and Philippa of Hainault. She succeeded to the title of suo jure Countess of Soissons, on 18 February 1397, upon the death of her father, Enguerrand VII de Coucy. In addition to her titles, she also owned numerous estates in North-Eastern France. Mary, Queen of Scots, King Henry IV of France, and the Bourbon kings of France were her direct descendants.