Dionysiaca

right|thumb|350px|The triumph of Dionysus, depicted on a 2nd-century Roman sarcophagus. Dionysus rides in a chariot drawn by panthers; his procession includes elephants and other exotic animals. The Dionysiaca (, Dionysiaká) is an ancient Greek epic poem and the principal work of Nonnus. It is an epic in 48 books, the longest surviving poem from Greco-Roman antiquity at 20,426 lines, composed in Homeric dialect and dactylic hexameters, the main subject of which is the life of Dionysus, his expedition to India, and his triumphant return to the west.

==Composition== The poem is thought to have been written in the 5th century AD. The suggestion that it is incomplete misses the significance of the birth of Dionysus' one son (Iacchus) in the final Book 48, quite apart from the fact that 48 is a key number as the number of books in the Iliad and Odyssey combined. The older view that Nonnus wrote this poem before conversion to Christianity and the writing of his other long poem, a verse paraphrase of the Gospel of John, is now discredited, since a host of indications point to the latter being the earlier work and because it misses the eclecticism of late antique culture. Editors have pointed out various inconsistencies and the difficulties of Book 39 which appears to be a disjointed series of descriptions, as evidence of lack of revision.