“That is to say, epic poetry has been invented many times and independently but, as the needs which prompted the invention have been broadly similar, so the invention itself has been.”
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If epic poetry is a definite species, the sagas do not fall within it.
The Border Ballads, for instance, and the Robin Hood Ballads, clearly suppose a state of society which is nothing but a very circumscribed and not very important heroic age.
Traditional matter must be glorified, since it would be easier to listen to the re-creation of familiar stories than to quite new and unexpected things the listeners, we must remember, needed poetry chiefly as the re-creation of tired hours.
The reason can only be this: heroic poetry depends on an heroic age, and an age is heroic because of what it is, not because of what it does.