The history of Roman studies since Niebuhr is largely the record of the activity of a single man. The most personal and popular of Mommsen's works, the _Roman History till the death of Caesar_, the greatest effort of his genius though not of his scholarship, was published as far back as 1854, and carried his name all over the world. He next turned to special departments of research, pouring forth in rapid succession his treatises on Chronology, Coinage, the Digest, and above all the _Staatsrecht_, the largest and in his opinion the most important of his works, and perhaps the greatest constitutional treatise in historical literature. Meanwhile the _Corpus Inscriptionum Latinarum_, which he edited for the Berlin Academy, was the main occupation and the most enduring monument of his life. He had devoted himself to Latin epigraphy and had edited the Sammite and Neapolitan inscriptions before the publication of the Roman History. The first instalment of the Corpus appeared in 1863, and the great scholar lived to hail the appearance of nearly twenty volumes, half of them edited by himself. The Inscriptions rendered possible a history of the Empire, and the whole world hoped that the master would write it; but he contented himself with a survey of the provinces. The closing years of his life were devoted to a gigantic treatise on Roman Criminal Law, and to editions of Jordanes, Cassiodorus, the Theodosian Code and the Liber Pontificalis, thus enlarging the sphere of his operations till Rome was swallowed up in the Middle Ages. His publications extended over sixty years. There is no immaturity in his early works and no decline in the later. The imaginative and critical faculties met and balanced, large vision mating with a genius for detail. The complete assimilation and reproduction of a classical civilization of which scholars have dreamed ever since Scaliger has been achieved by Mommsen alone. Rome before Mommsen was like modern Europe before Ranke. We may truly say of him, as was said of Augustus, that he found it of brick and left it of marble.