(Marcus), a Latin poet, whose poem had the ill luck to lie buried in some German libraries, and was not heard of in the world until Poggio, about two centuries ago, published him from some old manuscripts he found there. There is no account to be found of him but what can be drawn from his poem, which is called Astronomicon; and contains a system of the ancient astronomy and astrology, together with the philosophy of the Stoics. It consists of five books; though there was a sixth, which has not been recovered. From the style, and no mention of the author being found in ancient writers, it is probable he died young. It is collected, however, that he was a Roman of illustrious extraction, and lived under the reign of Augustus, whom he invokes, though not by name, yet by circumstances and character that suit no other emperor. The best editions of Manilius are, that of Joseph Scaliger in 1600, and that of Bentley at London in 1738.