Marcus Junius Brutus was a Roman senator, Stoic philosopher, and a leading assassin of Julius Caesar. Born in 85 BCE, he was educated in Athens and was fluent in Greek. He studied under the philosopher Aristus and maintained a correspondence with Cicero. After the assassination of Caesar in 44 BCE, Brutus was defeated by the forces of Mark Antony and Octavian at the Battle of Philippi in 42 BCE, after which he died by suicide.

A collection of letters in Koine Greek, known as the Epistulae Bruti or Letters of Brutus, is attributed to him. The authenticity of this corpus is a matter of scholarly dispute. While some letters, particularly those addressed to Cicero, may be genuine, others are considered likely to be later rhetorical exercises or forgeries.

These letters are valuable as historical artifacts from the final years of the Roman Republic, offering potential insight into the motivations and political communication of a principal figure. Their contested authenticity also makes the collection a significant case study in the later reception and idealization of Brutus as a symbol of republican virtue and Stoic principle.