In the time of Hesiod, the Fortunate Isles were associated with the concept of Elysium, a utopian location in the Greek underworld thought to be found in the Western ocean on the margin of the known world.
[6] The Theban poet Pindar reduced the number of the islands to one, describing it as having shady parklands with residents indulging in athletic and musical pastimes, activities that were thought to be the ideal life for ancient Greek aristocracy.
[7]It was from these men that Sertorius learned facts so beguiling that he considered retiring from Roman political life altogether to these islands, but conflicts to come prevented him from pursuing this rumour further.
Therefore a firm belief has made its way, even to the barbarians, that here are the Elysian Fields and the abode of the Blessed of which Homer sang.Pliny the Elder's Natural History adds to the obligatory description—that they "abound in fruit and birds of every kind"—the unexpected detail that, "[t]hese islands, however, are greatly annoyed by the putrefying bodies of monsters, which are constantly thrown up by the sea".
Ptolemy used these islands as the reference for the measurement of geographical longitude and they continued to play the role of defining the prime meridian through the Middle Ages.