 He shared this life with Henriette Hauser (also Hausser), his Parisian mistress, a "boulevard theatre" actress.The Duke de Gramont-Caderousse, a French fellow hedonist, gave him the nickname "Prince Lemon" ["le prince Citron" in French]; the nickname became popular among the regulars in the recently created boulevards and the Parisian newspapers when they reported about his debauched lifestyle.Prince William died at the age of 38 in his apartment in the Rue Auber, near the Paris Opera from a combination of typhus, liver complaints and total exhaustion.