Theophrastus student of Plato
After receiving instruction in philosophy on Lesbos from one Alcippus, he moved to Athens, where he may have studied under Plato. He became friends with Aristotle, and when Plato died (348/7 BC) Theophrastus may have joined Aristotle in his self-imposed exile from Athens. When Aristotle moved to Mytilene on Lesbos in 345/4, it is very likely that he did so at the urging of Theophrastus. It seems that it was on Lesbos that Aristotle and Theophrastus began their research into natural science, with Aristotle studying animals and Theophrastus studying plants. Theophrastus probably accompanied Aristotle to Macedonia when Aristotle was appointed tutor to Alexander the Great in 343/2. Around 335 BC, Theophrastus moved with Aristotle to Athens, where Aristotle began teaching in the Lyceum. When, after the death of Alexander, anti-Macedonian feeling forced Aristotle to leave Athens, Theophrastus remained behind as head (scholarch) of the Peripatetic school, a position he continued to hold after Aristotle's death in 322/1.
Aristotle in his will made him guardian of his children, including Nicomachus, with whom he was close. Aristotle likewise bequeathed to him his library and the originals of his works, and designated him as his successor at the Lyceum. Eudemus of Rhodes also had some claims to this position, and Aristoxenus is said to have resented Aristotle's choice.Theophrastus presided over the Peripatetic school for thirty-five years, and died at the age of eighty-five according to Diogenes.
He is said to have remarked, "We die just when we are beginning to live".Under his guidance the school flourished greatly—there were at one period more than 2000 students, Diogenes affirms—and at his death, according to the terms of his will preserved by Diogenes, he bequeathed to it his garden with house and colonnades as a permanent seat of instruction. The comic poet Menander was among his pupils. His popularity was shown in the regard paid to him by Philip, Cassander, and Ptolemy, and by the complete failure of a charge of impiety brought against him. He was honored with a public funeral, and "the whole population of Athens, honouring him greatly, followed him to the grave." He was succeeded as head of the Lyceum by Strato of Lampsacus.
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