treaty with Castille was signed on 28 February 1336. Joan and Philip returned to Navarre in April 1336. Their second visit lasted till October 1337. Philip twice returned to the realm, but Joan did not accompany him. Philip III died in September 1343. She soon replaced Philip of Melun, who had administered Navarre in the royal couple's name, with William of Brahe. Before long, she also dismissed William of Brahe, replacing him with Jean de Conflans. These changes may have reflected a disagreement with Philip over administration of Navarre, according to historian Elena Woodacre. In 1344, a copy of the Fueros of Navarre was arranged for the queen in the local Romance language (in ydiomate Navarre), providing a spare column for its translation to the ydioma galicanum (a French variant) eventually left a blank. French was probably the natural language used by Joan, even to deal with matters related with Navarre. Joan established the convent of San Francisco in Olite in 1345. Joan decided to again visit Navarre, but she never returned, most probably because of the possibility of an invasion of her family's domains in France during the Hundred Years War. She and her husband had supported Philip VI against Edward III of England, who claimed the French throne as the son of Joan's aunt Isabella. By 1346, however, Joan was disappointed by Philip VI's failures as military leader. In November she boldly concluded a truce with the Earl of Lancaster, granting Edward's troops free passage through her county of Angoulême in return for protection of her lands. She also promised not to build new fortification or allow Philip's army to use the existing ones. Philip was unable to take action against her. Joan died of Black Death on 6 October 1349. In her last will, she requested that her son finance a chapel in Santa Maria of Olite. She was buried in the Basilica of St Denis, though her heart was buried at the now-demolished church of the Couvent des Jacobins in Paris alongside that of her husband's. Family Joan's husband, Philip of Évreux, was a grandson of Philip III of France. They were efficient as co-rulers but no evidence attests to the closeness of their personal relationship, in contrast to the well-documented marriages of Joan's grandparents, father and uncles. This indicates that their marriage was marked neither by particular affection nor difficulty. They were very rarely apart,