This volume of The History of Rome by the Nobel Prize winning classical historian Theodor Mommsen (1817-1903) begins with Pompey and Julius Caesar and ends with the battle of Thapsus. This monumental work became the enduring rival of Edward Gibbon's Decline and Fall of the Roman Empire.

Volume 4, Part 2 of Mommsen's monumental 1850s History of Rome, first published in English in 1863.