Isabeau of Bavaria
After giving birth in 1351 to a posthumous daughter, Blanche refused to remarry King Peter of Castile and retired to the large dower lands that were granted by her late husband. Despite her widowhood, she played an essential role in 1354 by attempting to reconcile her brother King Charles II of Navarre with King John II of France. In 1389 she organized the coronation of Isabeau of Bavaria, the wife of King Charles VI of France.