Treaty of Guérande

…as John IV, by the Treaty of Guérande (1365). Thenceforward he and his descendants John V (d. 1442), Francis I (d. 1450), Peter II (d. 1457), Arthur III (d. 1458; see Richemont, Arthur, constable de), and Francis II (d. 1488) constituted the House of Montfort as dukes of Brittany. But…

…V of France in the Treaty of Guérande (April 12, 1365). John secretly aided Edward’s cause in 1370, giving the English soldier Robert Knowles a haven in Brittany when Knowles faced defeat at the hands of French forces. In 1372, after making an alliance with Edward, John was granted the…