Macrobius Ambrosius Theodosius, commonly referred to as Macrobius, was a Roman who flourished during the early fifth century. He is primarily known for his writings, which include the Saturnalia, a compendium of ancient Roman religious and antiquarian lore, the Commentarii in Somnium Scipionis ("Commentary on the Dream of Scipio"), which was an important source for Platonism in the Latin West during the Middle Ages, and De differentiis et societatibus graeci latinique verbi ("On the Differences and Similarities of the Greek and Latin Verb") which is now lost.