David was a Greek scholar and a commentator on 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...

 and 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...

.

He may have come from Thessaly

Thessaly

Thessaly is a traditional geographical region and an administrative region of Greece, comprising most of the ancient region of the same name. Before the Greek Dark Ages, Thessaly was known as Aeolia, and appears thus in Homer's Odyssey....

, but in later times he was confused with an Armenia

Armenia

Armenia , officially the Republic of Armenia , is a landlocked mountainous country in the Caucasus region of Eurasia...

n of the same name (David Anhaght). He was a pupil of Olympiodorus

Olympiodorus the Younger

Olympiodorus the Younger was a Neoplatonist philosopher, astrologer and teacher who lived in the early years of the Byzantine Empire, after Justinian's Decree of 529 A.D. which closed Plato's Academy in Athens and other pagan schools...

 in Alexandria

Alexandria

Alexandria is the second-largest city of Egypt, with a population of 4.1 million, extending about along the coast of the Mediterranean Sea in the north central part of the country; it is also the largest city lying directly on the Mediterranean coast. It is Egypt's largest seaport, serving...

 in the late 6th century. His name suggests that he was a Christian

Christian

A Christian is a person who adheres to Christianity, an Abrahamic, monotheistic religion based on the life and teachings of Jesus of Nazareth as recorded in the Canonical gospels and the letters of the New Testament...

.

Two Greek

Greek language

Greek is an independent branch of the Indo-European family of languages. Native to the southern Balkans, it has the longest documented history of any Indo-European language, spanning 34 centuries of written records. Its writing system has been the Greek alphabet for the majority of its history;...

 commentaries attributed to him have survived: as well as an introduction to philosophy (prolegomena):

• Prolegomena
• Commentary on 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...
  
  's Isagoge
• Commentary on 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 Categories

However, it is possible that the Commentary on Aristotle's Categories is actually by his contemporary Elias

Elias (commentator)

Elias was a Greek scholar and a commentator on Aristotle and Porphyry.He was a pupil of Olympiodorus in Alexandria in the late-6th century. His name suggests that he was a Christian. A commentary on Porphyry's Isagoge written in Greek has survived...

.

Another anonymous commentary on Porphyry's Isagoge which was falsely ascribed to Elias (pseudo-Elias), was also falsely ascribed to David.