 Some testimonia suggest that there were even more pseudo-Archytan treatises, which have not survived even in fragments (Thesleff 47.8 ff.). Two spurious letters of Archytas survive. One is the letter to which the pseudo-Platonic Twelfth Letter is responding (D.L. VIII 79–80), and the other is the purported letter of Archytas to Dionysius II, which was sent along with the ship in order to secure Plato’s release in 361 (D.L. III 21–2). Archytas was a popular figure in the Middle Ages and early Renaissance, when works continued to be written in his name, usually with the spelling Architas or Archita. The Ars geometriae, which is ascribed to Boethius, but was in reality composed in the 12th century (Folkerts 1970, 105), ascribes discoveries in mathematics to Architas which are clearly spurious (Burkert 1972a, 406). Several alchemical recipes involving the wax of the left ear of a dog and the heart of a wolf are ascribed to Architas in ps.-Albertus Magnus, The Marvels of the World (De mirabilibus mundi – 13th century AD). Numerous selections from a book entitled On Events in Nature (de eventibus in natura, also cited as de effectibus in natura and as de eventibus futurorum) by Archita Tharentinus (or Tharentinus, or just Tharen) are preserved in the medieval texts known as The Light of the Soul (Lumen Animae), which were composed in the fourteenth century and circulated widely in Europe in the fifteenth century as a manual for preachers (Rouse 1971; Thorndike 1934, III 546–60). An apocryphal work, The Circular Theory of the Things in the Heaven, by Archytas Maximus [!], which has never been published in full, is preserved in Codex Ambrosianus D 27 sup. (See Catalogus Codicum Astrologorum Graecorum, ed. F. Cumont et al., Vol. III, p. 11). 