* Aristotle lived in Ancient Greece (384-322 BCE). At this time, Latin was spoken primarily in the Roman Republic and later Roman Empire.
* Greek was the official language of Ancient Greece, and Aristotle wrote all of his works in Greek. He was a philosopher and scholar in the Lyceum, a philosophical school in Athens.
Latin became the dominant language of scholarship in Europe much later, during the Medieval period (roughly 5th-15th centuries).