Can you name two of the great ancient Greek philosophers?

Some ancient Greek Philosophers were:

1. Heraclitus

2. Socrates, very famous.

3. Plato, also a mathematician and a student of Socrates

4. Aristotle, extremely famous, student of Plato. Aristotle educated Alexander the great.

5. Pythagoras, also a mathematician.

There is 5 for you. I know you asked for two but I love ancient Greece. I got a bit carried away, but definitely the two most famous would have to be Socrates first then Aristotle.