Ingres - The Apotheosis of Homer (1827)

I went through trying to identify some of them before posting the puzzle but it is a slow process...

The Iliad and the Odyssey are at Homer's feet and following is a list of notables in the painting, according to Wikipedia
Molière
Dante
Miguel de Cervantes
Racine
William Shakespeare
Voltaire
Seneca
Virgil
Aesop
Pindar
Hesiod
Plato
Socrates
Pericles
Pheidias
Michelangelo
Alexander the Great
Luis Vaz de Camões
Fenelon
Longinus[disambiguation needed]
Boileau
Corneille
Poussin
Gluck
Mozart
Horace
Raphael
Sappho
Apelles
Lycurgus
Euripides
Menander
Sophocles
Aeschylus
Herodotus
Orpheus