This famous phrase uttered by Julius Caesar when he was assassinated by a group of conspirators in the Senate.
Traditionally it is believed that he was referring to Marcus Junius Brutus, son of Servilia, who in turn was Julius Caesar's lover for a long time. It was even believed that he could be his son (but the dates do not add up). Julius Caesar proclaimed himself dictator, monopolizing all power and eliminating the Republic. Marcus Brutus, along with Cassius, and other senators conspired against the dictator, but he knew it. On March 15, 44 BC, Julius Caesar was stabbed several times on the steps of the Roman Senate. Therefore, it does not make sense that this expression referred to Marcus Brutus, because Julius Caesar knew that he was with the conspirators. So…
There was another "Brute", Tenth Albino Brutus. He was also part of the conspiracy and was very dear to Caesar.
To curl the loop, according to Suetonius the literal phrase was «Kai sú, teknon » (in Greek). There are also two versions here:some say it was a question and others an exclamation.
Who was he referring to? Who knows.