 In the Arabic sources we find many references to Theophrastus’ life, works and sayings, but only the translations of two genuine Theophrastean texts have been preserved; namely, the Metaphysics or On First Principles and the Meteorology. It is not surprising, however, that Theophrastus’ works were neither extensively copied nor much quoted in the Arabic philosophical literature. One of the reasons suggested is the fact that from 900 to 1050 the promotion of Aristotle by the school of Baghdad as the most important philosopher eclipsed other Peripatetics, whose works were not seen to be commentaries on the Aristotelian treatises. In addition, Theophrastus’ treatises with their aporetic nature and identical titles with those of Aristotle were hardly appropriate for constructing a dogmatic Aristotelian system, which the Baghdad Peripatetics were seeking. Finally, after 1050 the crushing influence of Avicenna caused the disappearance of manuscript copies even of Aristotle’s works, let alone of Theophrastus (see Gutas 1985, 1999; Daiber 1985).