Leo the Mathematician or the Philosopher (Greek: Λέων ὁ Μαθηματικός or Φιλόσοφος, Léōn o Mathēmatikós or Philósophos; c. 790 – after 869) was a Byzantine philosopher and logician associated with the Macedonian Renaissance and the end of Iconoclasm. His only preserved writings are some notes contained in manuscripts of Plato's dialogues. He has been called a "true Renaissance man" and "the cleverest man in Byzantium in the 9th century".