Adrastus of Aphrodisias
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Adrastus of Aphrodisias
Aphrodisias
Aphrodisias was a small city in Caria, on the southwest coast of Asia Minor. Its site is located near the modern village of Geyre, Turkey, about 230 km from İzmir....

 was a Peripatetic philosopher who lived in the 2nd century AD. He was the author of a treatise on the arrangement of Aristotle
Aristotle
Aristotle was a Greek philosopher and polymath, a student of Plato and teacher of Alexander the Great. His writings cover many subjects, including physics, metaphysics, poetry, theater, music, logic, rhetoric, linguistics, politics, government, ethics, biology, and zoology...

's writings and his system of philosophy, quoted by Simplicius
Simplicius of Cilicia
Simplicius of Cilicia, was a disciple of Ammonius Hermiae and Damascius, and was one of the last of the Neoplatonists. He was among the pagan philosophers persecuted by Justinian in the early 6th century, and was forced for a time to seek refuge in the Persian court, before being allowed back into...

, and by Achilles Tatius
Achilles Tatius
Achilles Tatius of Alexandria was a Roman era Greek writer whose fame is attached to his only surviving work, the ancient Greek novel or romance The Adventures of Leucippe and Clitophon.-Life and minor works:...

. Some commentaries of his on the Timaeus
Timaeus (dialogue)
Timaeus is one of Plato's dialogues, mostly in the form of a long monologue given by the title character, written circa 360 BC. The work puts forward speculation on the nature of the physical world and human beings. It is followed by the dialogue Critias.Speakers of the dialogue are Socrates,...

of Plato
Plato
Plato , was a Classical Greek philosopher, mathematician, student of Socrates, writer of philosophical dialogues, and founder of the Academy in Athens, the first institution of higher learning in the Western world. Along with his mentor, Socrates, and his student, Aristotle, Plato helped to lay the...

 are also quoted by Porphyry
Porphyry (philosopher)
Porphyry of Tyre , Porphyrios, AD 234–c. 305) was a Neoplatonic philosopher who was born in Tyre. He edited and published the Enneads, the only collection of the work of his teacher Plotinus. He also wrote many works himself on a wide variety of topics...

, and a treatise on the Categories
Categories (Aristotle)
The Categories is a text from Aristotle's Organon that enumerates all the possible kinds of thing that can be the subject or the predicate of a proposition...

of Aristotle by Galen
Galen
Aelius Galenus or Claudius Galenus , better known as Galen of Pergamon , was a prominent Roman physician, surgeon and philosopher...

. None of these have come down to us. He was a competent mathematician
Mathematician
A mathematician is a person whose primary area of study is the field of mathematics. Mathematicians are concerned with quantity, structure, space, and change....

, whose writings on harmonics are frequently cited by Theon of Smyrna
Theon of Smyrna
Theon of Smyrna was a Greek philosopher and mathematician, whose works were strongly influenced by the Pythagorean school of thought. His surviving On Mathematics Useful for the Understanding of Plato is an introductory survey of Greek mathematics.-Life:Little is known about the life of Theon of...

 in the surviving sections of his On Mathematics Useful for the Understanding of Plato. In the 17th century, a work by Adrastus on harmonics, ("On Harmonics"), was said by Gerhard Johann Vossius
Gerhard Johann Vossius
thumb|180px|Gerrit Johan VossiusGerrit Janszoon Vos , often known by his Latin name Gerardus Vossius, was a Dutch classical scholar and theologian.-Life:...

 to have been preserved, in manuscript, in the Vatican Library
Vatican Library
The Vatican Library is the library of the Holy See, currently located in Vatican City. It is one of the oldest libraries in the world and contains one of the most significant collections of historical texts. Formally established in 1475, though in fact much older, it has 75,000 codices from...

, although the manuscript appears to be no longer extant, if indeed this was not an error on Vossius' part.

Adrastus of Philippi
Philippi
Philippi was a city in eastern Macedonia, established by Philip II in 356 BC and abandoned in the 14th century after the Ottoman conquest...

is also reported by Stephanus of Byzantium
Stephanus of Byzantium
Stephen of Byzantium, also known as Stephanus Byzantinus , was the author of an important geographical dictionary entitled Ethnica...

, as a peripatetic philosopher, he is presumably the same philosopher, unless there was a different, earlier, disciple of Aristotle.
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