Et tu, Brute? (pronounced [ɛt ˈtuː ˈbruːtɛ]) is a Latin phrase meaning "and you, Brutus?", "even you, Brutus?" or "you too, Brutus?", purportedly as the last words of the Roman dictator Julius Caesar to his friend Marcus Brutus at the moment of his assassination. The quotation is widely used in the English-speaking world to signify the utmost unexpected betrayal by a person, such as a friend.
The fame of the quotation is entirely due to its occurrence in William Shakespeare's play Julius Caesar, as Caesar utters these words as he is being stabbed to death, having recognized his friend and protégé Brutus among the assassins. However, there is no evidence that the real Caesar actually said these words.
Another common translation for the phrase is "You too, Brutus?". Literally, the Latin phrase translates to "and" (or "also") "you, Brutus?". The name "Brutus", a second declension masculine noun, appears in the phrase in the vocative case, and so the -us ending of the nominative case is replaced by -e.
On March 15 (the Ides of March), 44 BCE, Caesar was attacked by a group of senators, including Marcus Junius Brutus, Caesar's friend and protégé. Caesar initially resisted his attackers, but when he saw Brutus, he supposedly spoke those words and resigned himself to his fate.