Marcus Manilius (MAHR-kuhs ma-NIHL-ee-uhs) wrote a long didactic poem in five books, the Astronomica (n.d.; English translation, 1977), a treatise on astrology. Nothing is known about his life. Scholars surmise from his zodiacal allusion in Book 4 of the Astronomica to the ascension of Tiberius (14 c.e.) that he outlived Augustus. His name was probably Marcus Manilius, but other forms are possible. He may have been Roman. He knew the works of Vergil, Livy, and Cicero, and he specifically opposed the poet Lucretius, but since his apparent knowledge of Greek literature was broader, he may have been Greek. His idiosyncratic Latin diction suggests that he may have been from Asia Minor.