  Aristotle’s pupil and successor Theophrastus of Eresus (c. 371–c. 287 BCE) wrote more logical treatises than his teacher, with a large overlap in topics. Eudemus of Rhodes (later 4th cent. BCE) wrote books entitled Categories, Analytics and On Speech. Of all these works only a number of fragments and later testimonies survive, mostly in  commentators on Aristotle. Theophrastus and Eudemus simplified some aspects of Aristotle’s logic, and developed others where Aristotle left us only hints.