Plato's unwritten doctrines are metaphysical theories ascribed to him by his students and other ancient philosophers but not clearly formulated in his writings. In recent research, they are sometimes
Aristotle referred to Plato's 'unwritten doctrines' and discussed Plato's principle theory.
Papirus Oxyrhynchus, with fragment of Plato's Republic
The beginning of the Seventh Letter in the oldest, surviving manuscript from the ninth century CE (Paris, Bibliothèque Nationale, Gr. 1807)
Aristotle, his student Theophrastus, and Strato of Lampsacus (National and Kapodistrian University of Athens)
Plotinus was an ancient Greek philosopher, born and raised in Roman Egypt. He is widely regarded by modern scholars as the founder of Neoplatonism.
Head in white marble. The identification as Plotinus is plausible but not proven.
Presumed depiction of Plotinus and his disciples on a Roman sarcophagus in the Museo Gregoriano Profano, Vatican Museums, Rome