Who was a teacher of Plato?

While Aristotle was a student of Plato, he did not teach Plato; rather, he was part of the philosophical lineage that followed from Socrates through Plato. Aristotle's contributions were significant, but he cannot be considered a teacher of Plato.

Zeno, known for his paradoxes and as the founder of Stoicism, did not have a direct teaching relationship with Plato. Although he contributed to philosophy, he was not a teacher in the context of Plato's education.

Epicurus, the founder of Epicureanism, lived after Plato and had his own school of thought. He was not a teacher of Plato, and their philosophies differed significantly, with Epicurus focusing on pleasure and the avoidance of pain.

Pythagoras, known for his contributions to mathematics and philosophy, predated Plato and had no direct influence as a teacher. While his ideas may have influenced the broader philosophical landscape, he was not involved in Plato's education.