1) Plato holding the Timaeus and pointing to the heavens                            symbolizing the Idealism that characterizes his view of the                    world  (the face is that of Leonardo Da Vince, who was Raphael's
  Plato holding the Timaeus and pointing to the heavens                            symbolizing the Idealism that characterizes his view of the                    world  (the face is that of Leonardo Da Vince, who was Raphael's 

 mentor)
 mentor)
 2) Aristotle holding the Ethics and gesturing towards the earth                   symbolizing the Realism that characterizes his view of the
  Aristotle holding the Ethics and gesturing towards the earth                   symbolizing the Realism that characterizes his view of the           world
   world
 3) Unknown
  Unknown
 4) Unknown
  Unknown
 5) Unknown
  Unknown
 6) Unknown
  Unknown
 7) Unknown
  Unknown
 8) Theopratus of Lesbos
  Theopratus of Lesbos
 9) Unknown
  Unknown
 10) Unknown
Unknown
 11) Unknown
Unknown
 12) Aristippus
Aristippus
 13) Unknown
Unknown
 14) Pyrrho of Elis
Pyrrho of Elis
 15)        Plotinus, 3rd Century Neo-Platonist
16) Unknown
Unknown
 17) Unknown
Unknown
 18)        Unknown
19)        Raphael - the artist
20) Perugino - Raphael’s teacher.
Perugino - Raphael’s teacher.
 21) Ptolemy holds an earthly globe
Ptolemy holds an earthly globe
 22) Zoroaster holds a globe of the starry universe.
Zoroaster holds a globe of the starry universe.
 23) Euclid - painted with s the features of Raphael’s great mentor
Euclid - painted with s the features of Raphael’s great mentor
             Donato Bramante who, as architect of St. Peter’s. 
24) 1st student anticipates the outcome of his teacher’
1st student anticipates the outcome of his teacher’
             demonstration
25) 2nd student shows the excitement of dawning
2nd student shows the excitement of dawning
  comprehension
     comprehension
26) 3rd student is at the phase of comprehension
3rd student is at the phase of comprehension
 27) His encouraging pat suggests that this may be an apprentice
His encouraging pat suggests that this may be an apprentice 
              teacher
These figures are all focused upon a slate with a diagram, drawing attention to the faculty of sight, which is also used by the astronomers who hold globes in their hands
28) Diogenes the Cynic is reading with a beggar’s cup in front.
Diogenes the Cynic is reading with a beggar’s cup in front. 
 29)        Heraclitus is a glum and antisocial character with the face of
             Michelangelo.
30)        Hypatia or Francesco Marie della Rovero
31) Parmenides or the musician Nicomachus
Parmenides or the musician Nicomachus 
 
32) Anaxagoras
  Anaxagoras
 33) Pythagoras
  Pythagoras 
 34) Empedocles
  Empedocles 
 35) Epicharmus or Averroes
  Epicharmus or Averroes 
 36) Federico II of Mantua
  Federico II of Mantua 
 37) Epicurus - founder of Hedonist Schoof of Philosophy
  Epicurus - founder of Hedonist Schoof of Philosophy
 38) Unknown
  Unknown
 39) Unknown
  Unknown
 40) Zeno of Critum - founder of the Stoic School of Philosophy
  Zeno of Critum - founder of the Stoic School of Philosophy
 41) Gorgias of Leontini
  Gorgias of Leontini
 
42) Diagoras of Melos
  Diagoras of Melos
 43) Kritias of Athens
  Kritias of Athens
 44) Aechines
  Aechines
 45) Alcibiades  is attired in armor embellished in gold
  Alcibiades  is attired in armor embellished in gold
 46) Xenophon
  Xenophon 
  
 47) Unknown
  Unknown
 48) Alexander
  Alexander
 49) Socrates
 Socrates
 
The sculpture at upper left is Apollo, god of poetry, music, and health. He has a lyre in one hand and the other rests upon a trunk around which coils the serpent (the Greek symbol of health). This god of beauty and harmony stands above two reliefs depicting the unmoderated passions of wrath and concupiscence.
The Sculpture above Plotinus is Athena, goddess of wisdom, crafts, and war. She is dressed in military garb and on her shield is the terrifying face of the Gorgon. Below her is a relief of Virtue elevated upon clouds, holding one hand at her breast, the seat of valor, while extending the other toward the earth with the scepter of her empire.