What year did the mentor of the person who wrote "Historia Plantarum" die?
Historia Plantarum (Theophrastus): Theophrastus's Enquiry into Plants or Historia Plantarum (Greek: Περὶ φυτῶν ἱστορία , "Peri phyton historia") was, along with his mentor Aristotle's "History of Animals", Pliny the Elder's "Natural History" and Dioscorides's "De Materia Medica", one of the most important books of natural history written in ancient times, and like them it was influential in the Renaissance. History of Animals:  It was written in the fourth century BC; Aristotle died in 322 BC.
322 BC