philip of navarre, count of longueville (1336–1363) was a younger brother and supporter of charles ii of navarre, a claimant to the french throne. the son of philip iii of navarre and joan ii of navarre, he married yolande of flanders in 1353. she was the daughter of robert of flanders and joan of brittany (from the house of capet) and the widow of henry iv of bar. the marriage was childless, though by his mistress jeannette d'aisy philip had two illegitimate children - lancelot (who was granted longueville as a gift in 1371 by his uncle charles ii of navarre so long as he served in the company of the duke of brittany) and robine (granted longueville by her uncle louis of navarre in 1367). philip and his brother charles fought against john ii of france in 1353.