PlutarchPrimary Source: Plutarch’s Parallel Lives compare famous Romans of the republican period with Greek counterparts. He includes well known figures such as Romulus, Caesar, Pompey, Sulla and Cicero, as well as those who are more obscure, at least to most modern readers. As biographies they focus on the personality and moral character of their subjects as much as their military and political activities (although Plutarch is more ‘historical’ in his style than Suetonius), with the aim of providing lessons for the audience to follow. Modern editions usually publish selections rather than the full collection, often chosen thematically: Oxford World Classics Roman Lives, Penguin’s Plutarch series.

https://global.oup.com/academic/product/roman-lives-9780199537389?cc=gb&lang=en& https://www.penguin.co.uk/authors/3703/plutarch.html

Livy Primary Source: The great Latin narrative history. Only a minority of Livy’s titanic 142 book history survive, but the Periochae, a collection of summaries of each book, of variable quality, do survive for all 142 books (except 136 and 137) and are available online. Livy’s narrative, especially for the earliest period, is extremely problematic and more reflective in many ways of his contemporary Augustan society (for which he is of immense use), but nonetheless Livy is the Roman narrative historian, and the information he gives about the middle Republic is, alongside Polybius’ equally problematic account, vital.

https://www.livius.org/articles/person/livy/livy-the-periochae

Dionysius of HalicarnassusPrimary Source: Dionysius was a Greek who came from Halicarnassus, modern Turkey, and made his career as a teacher and author in Rome under Augustus. His most important work was the Rhōmaïkḕ Arkhaiología, “Roman Antiquities”, which covered the history of Rome from the mythical foundation to the First Punic War. Of the original twenty books, the first nine have survived in their entirety, three others nearly complete and the rest in fragments. His work has a very pro-Roman ethos, often to an absurd degree, and one of his main aims was to show-off his rhetorical flourish; nevertheless, Roman Antiquities is one of our most important literary sources to the Archaic Rome and how Romans of the Augustan era understood their own early history. The 1937 Loeb English translation is available online.

http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Dionysius_of_Halicarnassus/home.html