Joan of Bar was niece to a a King of England but in which year did he gain this title?
Joan of Bar, Countess of Surrey Joan of Bar (died in 1361, London) was a daughter of Henry III, Count of Bar and Princess Eleanor of England, and niece of Edward II of England. She was unhappily married to John de Warenne, 7th Earl of Surrey. In 1345, Joan became the regent of Bar for her great-nephew Robert.
Arthur, Prince of Wales Arthur Tudor (20 September 1486 – 2 April 1502) was Prince of Wales, Earl of Chester and Duke of Cornwall. As the eldest son and heir apparent of Henry VII of England, Arthur was viewed by contemporaries as the great hope of the newly established House of Tudor. His mother, Elizabeth of York, was the daughter of Edward IV, and his birth cemented the union between the House of Tudor and the House of York.