fragmentary work on women's beauty treatments), preceded the Ars Amatoria (the Art of Love), a parody of didactic poetry and a three-book manual about seduction and intrigue, which has been dated to AD 2 (Books 1–2 would go back to 1 BC). Ovid may identify this work in his exile poetry as the carmen, or song, which was one cause of his banishment. The Ars Amatoria was followed by the Remedia Amoris in the same year. This corpus of elegiac, erotic poetry earned Ovid a place among the chief Roman elegists Gallus, Tibullus, and Propertius, of whom he saw himself as the fourth member. By 8 AD, Ovid had completed Metamorphoses, his most ambitious work, a hexameter epic poem in 15 books. Here he catalogued encyclopedically transformations in Greek and Roman mythology, from the emergence of the cosmos to the apotheosis of Julius Caesar. The stories follow each other in the telling of human beings transformed to new bodies: trees, rocks, animals, flowers, constellations, etc. Simultaneously, he worked on the Fasti, a six-book poem in elegiac couplets on the theme of the calendar of Roman festivals and astronomy. The composition of this poem was interrupted by Ovid's exile, and it is thought that Ovid abandoned work on the piece in Tomis. It is probably in this period that the double letters (16–21) in the Heroides were composed, although there is some contention over their authorship. Exile to Tomis In AD 8, Ovid was banished to Tomis, on the Black Sea, by the exclusive intervention of the Emperor Augustus without any participation of the Senate or of any Roman judge. This event shaped all his following poetry. Ovid wrote that the reason for his exile was carmen et error – "a poem and a mistake", claiming that his crime was worse than murder, more harmful than poetry. The Emperor's grandchildren, Julia the Younger and Agrippa Postumus (the latter adopted by him), were also banished around the same time. Julia's husband, Lucius Aemilius Paullus, was put to death for a conspiracy against Augustus, a conspiracy of which Ovid potentially knew. The Julian marriage laws of 18 BC, which promoted monogamous marriage to increase the population's birth rate, were fresh in the Roman mind. Ovid's writing in the Ars Amatoria concerned the serious crime of adultery. He may have been banished for these works, which appeared subversive to the emperor's moral legislation. However,