Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
PREFACE BY THE TRANSLATOR
When the first portion of this translation appeared in 1861, it was accompanied by a Preface, for which I was indebted to the kindness of the late Dr. Schmitz, introducing to the English reader the work of an author whose name and merits, though already known to scholars, were far less widely familiar than they are now. After thirty-three years such an introduction is no longer needed, but none the less gratefully do I recall how much the book owed at the outset to Dr. Schmitz's friendly offices.
The following extracts from my own "Prefatory Note" dated "December 1861" state the circumstances under which I undertook the translation, and give some explanations as to its method and aims:--
"In requesting English scholars to receive with indulgence this first portion of a translation of Dr. Mommsen's 'Romische Geschichte,' I am somewhat in the position of Albinus; who, when appealing to his readers to pardon the imperfections of the Roman History which he had written in indifferent Greek, was met by Cato with the rejoinder that he was not compelled to write at all--that, if the Amphictyonic Council had laid their commands on him, the case would have been different--but that it was quite out of place to ask the indulgence of his readers when his task had been self-imposed. I may state, however, that I did not undertake this task, until I had sought to ascertain whether it was likely to be taken up by any one more qualified to do justice to it. When Dr. Mommsen's work accidentally came into my hands some years after its first appearance, and revived my interest in studies which I had long laid aside for others more strictly professional, I had little doubt that its merits would have already attracted sufficient attention amidst the learned leisure of Oxford to induce some of her great scholars to clothe it in an English dress. But it appeared on inquiry that, while there was a great desire to see it translated, and the purpose of translating it had been entertained in more quarters than one, the projects had from various causes miscarried. Mr. George Robertson published an excellent translation (to which, so far as it goes, I desire to acknowledge my obligations) of the introductory chapters on the early inhabitants of Italy; but other studies and engagements did not permit him to proceed with it. I accordingly requested and obtained Dr. Mommsen's permission to translate his work.
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Reference address : https://www.ellopos.net/elpenor/rome/1-00-contents.asp?pg=2