Who is the author of both Bellum Catilinae and Bellum Jugurthinium?

The correct answer is Sallust, who is renowned for his contributions to Roman historical literature. Bellum Catilinae, or "The War against Catiline," details the conspiracy led by Lucius Sergius Catilina to overthrow the Roman Republic, while Bellum Jugurthinium, or "The War against Jugurtha," recounts the conflict between Rome and Jugurtha, the king of Numidia. Sallust's works are characterized by their historical analysis and moral reflection on the events he describes, making him a key figure in the development of historiography in ancient Rome.

The other authors listed are known for different contributions to literature. Caesar, primarily recognized for his military campaigns and political writings, Cicero for his oratory and philosophy, and Catullus for his poetry, do not share the same historical focus or background as Sallust in the context of those specific works. Thus, Sallust's authorship establishes him as a significant historian whose writings offer insight into Roman political and military affairs of his time.