Dante Alighieri's Divine Comedy, derived features of and episodes about Bolgia from Arabic works on Islamic eschatology: the Hadith and the Kitab al-Miraj (translated into Latin in 1264 or shortly before as Liber Scale Machometi) concerning the ascension to Heaven of Muhammad, and the spiritual writings of Ibn Arabi. In what century is it believed that delegations of Moors began to influence western works by the likes of Shakespeare?