The Tragedy of Julius Caesar is a history play and tragedy by William Shakespeare first performed in 1599. It is one of four plays written by Shakespeare based on true events from Roman history, the others being Coriolanus, Titus Andronicus, and Antony and Cleopatra. Set in Rome in 44 BC, the play depicts the moral dilemma of Brutus as he joins a conspiracy led by Cassius to murder Julius Caesar to prevent him from becoming dictator of Rome. Following Caesar's death, Rome is thrust into a period of civil war, and the republic the conspirators sought to preserve is lost forever.

References:
https://en.wikipedia.org/wiki/Julius_Caesar_(play)