Short answers, pulled from the story.
Dionysius of Halicarnassus was a Greek historian and teacher of rhetoric born around 60 BC in Halicarnassus. He moved to Rome after the civil wars ended, spent twenty-two years studying Latin and preparing his history, and flourished during the reign of Emperor Augustus.
Roman Antiquities, known in Greek as Rhōmaikē Archaiologia, is a history of Rome in twenty books covering events from the mythical period to the outbreak of the First Punic War in 264 BC. Only the first nine books survive intact; the remaining books exist as fragments preserved in Byzantine compilations and a Milan manuscript.
Dionysius wrote about Romulus and Remus across Book I chapter 73 through Book II chapter 56 of his Roman Antiquities. He identified their mother as a vestal named Ilia Silvia, recorded multiple versions of their survival including both the she-wolf story and a non-fantastical alternate account, and described how a dispute over whether to build Rome on the Palatine Hill or Remoria led to the death of Remus.
Dionysian imitatio was Dionysius's formulation of a rhetorical practice involving emulating, adapting, reworking, and enriching a source text by an earlier author. It differed from Aristotle's mimesis, which addressed only imitation of nature, and was adopted by Latin orators and rhetoricians who discarded the Aristotelian approach.
Dionysius spent twenty-two years in Rome studying Latin, researching literature, and preparing materials for his Roman Antiquities. During that time he also taught rhetoric and moved in the company of many distinguished men.
Dionysius wrote several rhetorical treatises including The Art of Rhetoric, The Arrangement of Words, On Imitation, Commentaries on the Attic Orators covering Lysias, Isaeus, Isocrates, and Dinarchus, On the Admirable Style of Demosthenes, and On the Character of Thucydides. He also wrote letters to Gn. Pompeius and Ammaeus.