Answer: certainly popular myth. It is observable that mostly anonymous ‘stories’ fix some starting point in the evolution of nation’s culture. Whether it is some kind of poem or a long long story, whether it pretends to more or less historical accuracy (Herodotus) or not (Odyssee) it seems to jump out of oral popular tradition. This forms some backing in common memory. After, there is usually some deep silence (Greece: finally written down Homer, 8th century bc, appearance of highlights in greek literature, 6th to 5th century; Spain: finally written down Cid 8th to 10th ac, appearance of ‘the golden century’ in literature 16th, etc …). After which some particular genius in a more or less general environment (Spain: 16th, France: 18th, Germany, England and Russia: 19th, etc.) develops what seems to have been worked out by a more common understanding in more developped literary figures, linguistic ability, structured plots, etc.