I have not, I repeat, undertaken to write a commentary. I propose rather to give the materials for commentary to those who, for various reasons, do not care to use the Greek of Polybius. I have therefore in the first five complete books left him to speak for himself, with the minimum of notes which seemed necessary for the understanding of his text. The case of the fragments was different. In giving a translation of them I have tried, when possible, to indicate the part of the history to which they belong, and to connect them by brief sketches of intermediate events, with full references to those authors who supply the missing links. Imperfect as the performance of such a task must, I fear, be, it has been one of no ordinary labour, and has occupied every hour that could be spared during several years of a not unlaborious life. And though I cannot hope to have escaped errors, either of ignorance or human infirmity, I trust that I may have produced what will be found of use to some historical students, in giving them a fairly faithful representation of the works of an historian who is, in fact, our sole authority for some most interesting portions of the world’s history. It remains to give a brief account of the gradual formation of the text of Polybius, as we now have it. The revival of interest in the study of Polybius was due to Pope Nicholas V (1447-1455), the founder of the Vatican Library. Soon after his election he seems to have urged Cardinal Perotti to undertake a Latin translation of the five books then known to exist. When Perotti sent him his translation of the first book, the Pope thus acknowledges it in a letter dated 28th August 1452:—[1] “_Primus Polybii liber, quem ad nos misisti, nuper a te de Graeca in Latinam translatus, gratissimus etiam fuit et jucundissimus: quippe in ea translatione nobis cumulatissime satisfacis. Tanta enim facilitate et eloquentia transfers, ut Historia ipsa nunquam Graeca, sed prorsus Latina semper fuisse videatur. Optimum igitur ingenium tuum valde commendamus atque probamus, teque hortamur ut velis pro laude et gloria tua, et pro voluptate nimia singulare opus inchoatum perficere, nec labori parcas. Nam et rem ingenio et doctrina tua dignam, et nobis omnium gratissimam efficies; qui laborum et studiorum tuorum aliquando memores erimus.... Tu vero, si nobis rem gratam efficere cupis, nihil negligentiae committas in hoc opere traducendo. Nihil enim nobis gratius efficere poteris. Librum primum a vertice ad calcem legimus, in cujus translatione voluntati nostrae amplissime satisfactum est._”