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.
If epic poetry is a definite species the sagas do not fall within it.
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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.