The prime material of the epic poet, then, must be real and not
invented. But when the story of the poem is safely concerned with some
reality, he can, of course, graft on this as much appropriate invention
as he pleases; it will be one of his ways of elaborating his main,
unifying purpose--and to call it "unifying" is to assume that, however
brilliant his surrounding invention may be, the purpose will always be
firmly implicit in the central subject. Some of the early epics manage
to do without any conspicuous added invention designed to extend what
the main subject intends; but such nobly simple, forthright narrative as
_Beowulf_ and the _Song of Roland_ would not do for a purpose slightly
more subtle than what the makers of these ringing poems had in mind. The
reality of the central subject is, of course, to be understood broadly.
It means that the story must be founded deep in the general experience
of men. A decisive campaign is not, for the epic poet, any more real
than a legend full of human truth. All that the name of Caesar suggests
is extremely important for mankind; so is all that the name of Satan
suggests: Satan, in this sense, is as real as Caesar. And, as far as
reality is concerned, there is nothing to choose between the Christians
taking Jerusalem and the Greeks taking Troy; nor between Odysseus
sailing into fairyland and Vasco da Gama sailing round the world. It is
certainly possible that a poet might devise a story of such a kind that
we could easily take it as something which might have been a real human
experience. But that is not enough for the epic poet. He needs something
which everyone knows about, something which indisputably, and
admittedly, _has been_ a human experience; and even Grendel, the fiend
of the marshes, was, we can clearly see, for the poet of _Beowulf_ a
figure profoundly and generally accepted as not only true but real;
what, indeed, can be more real for poetry than a devouring fiend which
lives in pestilent fens? And the reason why epic poetry so imperiously