Roman literature came too late: that it reached such heights is a remarkable tribute to the greatness of Roman genius, even in its decline. With the exception of the satires of Lucilius and Horace there was practically no branch of literature that did not owe its inspiration and form to Greek models. Even the primitive national metre had died out. Roman literature--more especially poetry--was therefore bound to be unduly self-conscious and was always in danger of a lack of spontaneity. That Rome produced great prose writers is not surprising; they had copious and untouched material to deal with, and prose structure was naturally less rapidly and less radically affected by Greek influence. That she should have produced a Catullus, a Lucretius, a Vergil, a Horace, and--most wonderful of all--an Ovid was an amazing achievement, rendered not the less astonishing when it is remembered that the stern bent of the practical Roman mind did not in earlier days give high promise of poetry. The marvel is not wholly to be explained by the circumstances of the age. The new sense of power, the revival of the national spirit under the warming influence of peace and hope, that characterize the brilliant interval between the fall of the republic and the turbid stagnation of the empire, are not enough to account for it. Their influence would have been in vain had they not found remarkable genius ready for the kindling. The whole field of literature had been so thoroughly covered by the great writers of Hellas, that it was hard for the imitative Roman to be original. As far as epic poetry was concerned, Rome had poor material with which to deal: neither her mythology--the most prosaic and business-like of all mythologies--nor her history seemed to give any real scope for the epic writer. The Greek mythology was ready to hand, but it was hard for a Roman to treat it with high enthusiasm, and still harder to handle it with freshness and individuality. The purely historical epic is from its very nature doomed to failure. Treated with accuracy it becomes prosy, treated with fancy it becomes ridiculous. Vergil saw the one possible avenue to epic greatness. He went back into the legendary past where imagination could have free play, linked together the great heroic sagas of Greece with the scanty materials presented by the prehistoric legends of Rome, and kindled the whole work to life by his rich historical imagination and his sense of the grandeur of the Rome that was to be. His unerring choice of subject and his brilliant execution seemed to close to his successors all paths to epic fame. They had but well-worn and inferior themes wherefrom to choose, and the supremacy of Vergil's genius dominated their minds, becoming an obsession and a clog rather than an assistance to such poetic genius as they possessed. The same is true of Horace. As complete a master in lyric verse as Vergil in heroic, he left the after-comer no possibility of advance.