See Zonaras (l. xvi. p. 160, 161) and Cedrenus (p. 549, 550). Like Friar Bacon, the philosopher Leo has been transformed by ignorance into a conjurer; yet not so undeservedly, if he be the author of the oracles more commonly ascribed to the emperor of the same name. The physics of Leo in MS. are in the library of Vienna (Fabricius, Bibliot. Graec. tom. vi. p 366, tom. xii. p. 781). Quiescant!