<P> Later Jason and Peleus, father of the hero Achilles, attacked and defeated Acastus, reclaiming the throne of Iolcus for himself once more . Jason's son, Thessalus, then became king . </P> <P> As a result of breaking his vow to love Medea forever, Jason lost his favor with Hera and died lonely and unhappy . He was asleep under the stern of the rotting Argo when it fell on him, killing him instantly . </P> <P> Though some of the episodes of Jason's story draw on ancient material, the definitive telling, on which this account relies, is that of Apollonius of Rhodes in his epic poem Argonautica, written in Alexandria in the late 3rd century BC . </P> <P> Another Argonautica was written by Gaius Valerius Flaccus in the late 1st century AD, eight books in length . The poem ends abruptly with the request of Medea to accompany Jason on his homeward voyage . It is unclear if part of the epic poem has been lost, or if it was never finished . A third version is the Argonautica Orphica, which emphasizes the role of Orpheus in the story . </P>

Who wrote the story of jason and the argonauts