It is the glory of Virgil that alone with Dante and Milton he has achieved this; that he stands forth as the expression of an epoch, of a nation. That obedience to sovereign law, [49] which is the chief burden of the _Aeneid_, stands out among the diverse elements of Roman life as specially prominent, just as faith in the Church's doctrine is the burden of Mediaevalism as expressed in Dante, and as justification of God's dealings, as given in Scripture, forms the lesson of _Paradise Lost_, making it the best poetical representative of Protestant thought. None of Virgil's predecessors understood the conditions under which epic greatness was possible. His successors, in spite of his example, understood them still less. It has been said that no events are of themselves unsuited for epic treatment, simply because they are modern or historical. [50] This may be true; and yet, where is the poet that has succeeded in them? The early Roman poets were patriotic men; they chose for subjects the annals of Rome, which they celebrated in noble though unskilled verse. Naevius. Ennius, Accius, Hostius, Bibaculus, and Varius before Virgil, Lucan and Silius after him, treated national subjects, some of great antiquity, some almost contemporaneous. But they failed, as Voltaire failed, because historical events are not by themselves the natural subjects of heroic verse. Tasso chose a theme where history and romance were so blended as to admit of successful epic treatment; but such conditions are rare. Few would hesitate to prefer the histories of Herodotus and Livy to any poetical account whatever of the Persian and Punic wars; and in such preference they would be guided by a true principle, for the domain of history borders on and overlaps, but does not coincide with, that of poetry. The perception of this truth has led many, epic poets to err in the opposite extreme. They have left the region of truth altogether, and confined themselves to pure fancy or legend. This error is less serious than the first; for not only are legendary subjects well adapted for epic treatment, but they may be made the natural vehicle of deep or noble thought. The _Orlando Furioso_ and the _Faery Queen_ are examples of this. But more often the poet either uses his subject as a means for exhibiting his learning or style, as Statius, Cinna, and the Alexandrines; or loses sight of the deeper meaning altogether, and merely reproduces the beauty of the ancient myths without reference to their ideal truth, as was done by Ovid, and recently by Mr. Morris, with brilliant success, in his _Earthly Paradise_. This poem, like the _Metamorphoses_, does not claim to be a national epic, but both, by their vivid realization of a mythology which can never lose its charm, hold a legitimate place among the offshoots of epic song.