Marcus Junius Brutus (early June, 85 BC – late October, 42 BC), often referred to as Brutus, was a politician of the late Roman Republic. After being adopted by his uncle he used the name Quintus Servilius Caepio Brutus, but eventually returned to using his original name.
He is best known in modern times for taking a leading role in the assassination of Julius Caesar.
Marcus Junius Brutus the Younger was the son of Marcus Junius Brutus the Elder and Servilia Caepionis. His father was killed by Pompey the Great in dubious circumstances after he had taken part in the rebellion of Lepidus; his mother was the half-sister of Cato the Younger, and later Julius Caesar's mistress. Some sources refer to the possibility of Caesar being his real father, despite Caesar's being only 15 years old when Brutus was born.
Brutus' uncle, Quintus Servilius Caepio, adopted him in about 59 BC, and Brutus was known officially for a time as Quintus Servilius Caepio Brutus before he reverted to using his birth-name.