Mommsen's history of the Roman Republic in five volumes. These volumes cover from the founding of Rome up to the disintegration of the First Triumvirate (Caesar, Pompey, Crassus). The author cites dates in the Roman style, AUC, from the founding of the city in 753 BC. A table at the end shows modern-day equivalents. According to Wikipedia, Mommsen is "generally regarded as the greatest classicist of the 19th century." This work complements Gibbon's "Decline and Fall of the Roman Empire".
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The Persecution of Diocletian
The History of Parthian Empire (Annotated) : Enriched Edition. Iran's Silk Road superpower: from Arsaces I to Mithridates I, Parthia's rise between the Seleucids, Rome, and Han China
The American Revolution (Vol. 1&2) : Battle for American Independence: From the Rejection of the Stamp Act Until the Final Victory
History of Greece Volume 4: Greeks and Persians
The Holy Roman Empire
History of the United States : From Colonization to the League of Nations: A Comprehensive American Historical Odyssey
The Crimean War : Europe's Conflict with Russia
The Holy Roman Empire : Enriched edition.
The Life of Napoleon Bonaparte (Vol. 1-4) (Annotated) : Enriched Edition. Revolutionary, Strategist, Commander, Conqueror, Emperor, Prisoner
The Annals
Charles XII
A History of Ancient Rome
El mundo de los Césares
The History of Rome - All 5 Volumes in One Edition (Annotated) : Enriched Edition. Rome's Rise, Republic in Crisis, Punic Wars, and the Road to Caesar
The History of Rome (Complete Edition : Enriched edition. From the Foundations of the City to the Rule of Julius Caesar
The History of Rome (Complete 5 Volumes) (Annotated) : Enriched Edition. Rome's Rise from City-State to Empire: Republic, Punic Wars, Caesar, and the Birth of Military Monarchy
The Provinces of the Roman Empire (Illustrated Edition) : Enriched edition. Exploring the Roman Empire's Provincial Complexity
The History of Rome (Volumes 1-5) (Annotated) : Enriched Edition. Rome's Republic, Institutions, Wars, Social Conflict, and the Rise of Caesar
The History of Rome (Complete Edition : Enriched edition. From the Foundations of the City to the Rule of Julius Caesar
The Provinces of the Roman Empire from Caesar to Diocletian : Enriched edition. Including Historical Maps of All Roman Imperial Regions
The History of Rome : The Evolution of Ancient Rome: A Scholarly Exploration of Political Turmoil
The History of Rome : Enriched edition. The Rise of Rome's Military Power
The History of Rome : Unveiling the Dawn of Rome: Transitioning from Monarchy to Republic