 It is unclear why Philip stood by her in the way that he did.One theory has been that he was concerned that if he were to abandon Joan, he might also lose Burgundy; another theory suggests that his slightly "formulaic" love letters to his wife should be taken at face value, and that he was in fact very deeply in love.Philip's older brother, Louis X, died in 1316 leaving the pregnant Clementia of Hungary as his widow.