
Marcus Junius Brutus, the Roman politician, orator, and most famous of the assassins of Julius Caesar, had a brother-in-law named Gaius Cassius Longinus. Cassius was married to Junia Tertia, the half-sister of Brutus. Brutus and Cassius were both involved in the plot to assassinate Caesar, with Cassius being referred to as the moving spirit behind it. Following Caesar's assassination, Brutus and Cassius were forced to leave Rome and eventually faced Mark Antony and Octavian in the Battle of Philippi, where they were defeated.
| Characteristics | Values |
|---|---|
| Name | Gaius Cassius Longinus |
| Relationship with Brutus | Brother-in-law and co-conspirator in the assassination of Julius Caesar |
| Family | From a very old Roman family, gens Cassia |
| Spouse | Junia Tertia, half-sister of Brutus |
| Children | One son, born in c. 60 BC |
| Occupation | Politician, orator, and assassin |
| Notable Works | "Scrolls of Romulus" in the video game Assassin's Creed: Brotherhood |
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What You'll Learn
- Marcus Junius Brutus was a Roman politician, orator and assassin of Julius Caesar
- Brutus was the son of Servilia and Marcus Junius Brutus
- Brutus' brother-in-law, Gaius Cassius Longinus, was also his co-conspirator and friend
- Brutus' half-sister, Junia Tertia, was married to Cassius
- Brutus' brother-in-law refused to retreat and died charging into enemy ranks

Marcus Junius Brutus was a Roman politician, orator and assassin of Julius Caesar
Marcus Junius Brutus, born in 85 BC and died in 42 BC, was a Roman politician, orator, and one of the most famous assassins of Julius Caesar. He was adopted by his uncle, Quintus Servilius Caepio, and thus, his name became Quintus Servilius Caepio Brutus. He was raised by Cato and educated in oratory and philosophy. He was also proficient in Greek philosophy with a particular fondness for the Platonists.
Brutus was initially close to Caesar and even supported him when he became a dictator in 44 BC. However, he gradually began to question his loyalty to Caesar due to his disagreement with Caesar's role as a dictator. He believed that freedom required sharing power, which was in direct opposition to Caesar's rule. Brutus was also a descendant of Lucius Junius Brutus, who was known for driving the Etruscan kings out of Rome. This further influenced his decision to join the plot against Caesar, as he saw it as his destiny to fight for the Republic.
Gaius Cassius Longinus, Brutus' brother-in-law and friend, shared similar sentiments and conspired with other leading senators to assassinate Caesar. On March 15, 44 BC, the group successfully carried out their plan, with Cassius striking Caesar in the chest. Brutus and Cassius were then driven from Rome and sought refuge in Greece. They gradually gained control of the Roman East, including its armies and treasuries. However, Mark Antony seized power and turned the public against them.
Brutus and his forces were eventually defeated at the Battle of Philippi in 42 BC, where he committed suicide. His life and actions have been portrayed and referenced in various works of literature, theatre, and popular culture, including Shakespeare's "Julius Caesar."
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Brutus was the son of Servilia and Marcus Junius Brutus
Marcus Junius Brutus, born in 85 BC, was a Roman politician, orator, and one of the most famous assassins of Julius Caesar. He was the son of Servilia and Marcus Junius Brutus, a tribune of the same name. His father was executed in 77 BC by Pompey the Great, Brutus' future ally. Brutus' mother, Servilia, was also the lover of Julius Caesar, and some ancient sources speculate that Caesar may have been Brutus' biological father. However, modern scholars largely reject this theory as improbable.
After his father's death, Brutus was adopted by his uncle, Quintus Servilius Caepio, and he took on the name Quintus Servilius Caepio Brutus as his legal name. He was brought up by another uncle, Cato the Younger, who instilled in him the principles of Stoicism. Brutus' mother, Servilia, was a prominent figure, and she later became the lover of Julius Caesar. Brutus was also related to Cato the Younger, a prominent statesman, through his mother, who was Cato's half-sister.
Brutus had two notable brothers-in-law: Gaius Cassius Longinus and Publius Clodius Pulcher. Cassius was a fellow philosopher, politician, and leader in the conspiracy to assassinate Caesar. He and Brutus were close associates and shared a similar interest in philosophy. On the other hand, Publius Clodius Pulcher was Brutus' uncle-in-law and played a role in shaping Brutus' early political career.
Brutus was known for his republican ideals and his opposition to Pompey, who was responsible for his father's death. He initially supported Caesar but later opposed him due to Caesar's evasion of accountability in the law courts. Brutus eventually joined forces with Pompey against Caesar in the civil war from 49 to 45 BC. After Pompey's defeat at the Battle of Pharsalus in 48 BC, Brutus surrendered to Caesar and was granted amnesty. Despite his close relationship with Caesar, Brutus ultimately conspired against him, leading to Caesar's assassination on March 15, 44 BC.
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Brutus' brother-in-law, Gaius Cassius Longinus, was also his co-conspirator and friend
Marcus Junius Brutus, commonly referred to as Brutus, was a Roman politician, orator, and one of the most famous assassins of Julius Caesar. Brutus was close to Caesar, but his attempts to evade accountability in the law courts put him at odds with Brutus, who eventually joined Cassius and other leading senators in the plot to assassinate Caesar.
Gaius Cassius Longinus, Brutus' brother-in-law, was also his co-conspirator and friend. Cassius came from a prominent Roman family and was married to Junia Tertia, the half-sister of Brutus. Cassius was a philosopher with a serious interest in philosophy. He studied philosophy at Rhodes under Archelaus of Rhodes and became fluent in Greek. Cassius was also a military leader, having joined Marcus Licinius Crassus in his campaign against the Parthian Empire as quaestor. He led the retreat after the Battle of Carrhae and organised an effective defence force for the province. Cassius' reputation in the East enabled him to amass an army, and he was appointed governor of the province.
Cassius was a driving force in the plot against Caesar, winning over the chief assassins to the cause of tyrannicide. On the Ides of March, 44 BC, Cassius struck Caesar in the chest, and Brutus became their leader. After Caesar's assassination, Brutus and Cassius were driven from Rome and gradually seized all of the Roman East. Cassius was secure enough to march on Egypt, and he joined Brutus in Smyrna with most of his army. Together, they attacked the triumvirate's allies in Asia. Cassius and Brutus were later defeated by Mark Antony and Octavian at the Battle of Philippi in 42 BC, after which Brutus committed suicide.
The relationship between Brutus and Cassius has been immortalised in popular culture, including in Shakespeare's play 'Julius Caesar' and in the video game 'Assassin's Creed: Brotherhood', where they are depicted as members of the Roman Brotherhood of Assassins.
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Brutus' half-sister, Junia Tertia, was married to Cassius
Brutus, or Marcus Junius Brutus, was a Roman politician, orator, and the most famous of the assassins of Julius Caesar. He was the son of Servilia, who was the lover of Caesar. Brutus was married to Porcia Cato, the daughter of Cato.
Brutus had a half-sister, Junia Tertia, through his mother, Servilia, and her second husband, Decimus Junius Silanus. Junia Tertia was married to Gaius Cassius Longinus, who was Brutus' brother-in-law and fellow assassin of Caesar. Cassius came from a very old Roman family, gens Cassia, which had been prominent in Rome since the 6th century BC. He studied philosophy at Rhodes under Archelaus of Rhodes and became fluent in Greek.
Junia Tertia and Cassius had one son, who was born around 60-59 BC. Tertia had a miscarriage in 44 BC, the same year that Caesar was assassinated. Cassius committed suicide after the Republican defeat at Philippi in 42 BC, leaving Tertia a childless widow at 31. She lived to an advanced age, dying in 22 AD, 64 years after the battle at Philippi, during the reign of Emperor Tiberius.
Cassius and Brutus were closely linked, not only as brothers-in-law but also as co-conspirators in the assassination of Caesar. Cassius was "the moving spirit" behind the plot, winning over the chief assassins, while Brutus became their leader. On the Ides of March, 44 BC, Cassius struck Caesar in the chest, and together with Brutus and the other conspirators, succeeded in assassinating him. However, the celebration was short-lived as Mark Antony seized power and turned the public against them.
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Brutus' brother-in-law refused to retreat and died charging into enemy ranks
Brutus, or Marcus Junius Brutus, was a Roman politician, orator, and one of the chief conspirators in the assassination of Julius Caesar. Brutus was the son of Servilia and the tribune of the same name. He was the half-brother of Junia Tertia, who married Brutus' ally and co-conspirator, Gaius Cassius Longinus. They had one son, born around 60 BC.
Gaius Cassius Longinus, or simply Cassius, was Brutus' brother-in-law. He was from a prominent Roman family, the gens Cassia, which had been prominent in Rome since the 6th century BC. Cassius studied philosophy at Rhodes under Archelaus of Rhodes and became fluent in Greek. He joined Marcus Licinius Crassus in his eastern campaign against the Parthian Empire as quaestor in 54 BC. The following year, in 53 BC, Crassus led the Roman army at the Battle of Carrhae in Northern Mesopotamia, which resulted in a heavy defeat for the Romans. Cassius led the remaining troops in retreat back into Syria and organised an effective defence force for the province.
Cassius and Brutus were close friends and co-conspirators in the plot to assassinate Julius Caesar. Cassius was described as "the moving spirit" behind the plot, winning over the chief assassins to the cause of tyrannicide, while Brutus became their leader. On the Ides of March, 44 BC, Cassius struck Caesar in the chest, and they succeeded in assassinating him. However, their celebration was short-lived as Mark Antony seized power and turned the public against them.
Cassius' brother, Marcus Porcius Cato, was also Brutus' brother-in-law. According to Plutarch, Cato refused to retreat during the Battle of Philippi and charged into the enemy ranks without a helmet or armour, meeting his death. This act of bravery and defiance may have influenced the portrayal of Brutus' death in the HBO series "Rome", where Brutus walks towards the advancing enemy while stripping off his armour, forcing them to strike him down.
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Frequently asked questions
Gaius Cassius Longinus was Brutus' brother-in-law.
Cassius was married to Junia Tertia, the half-sister of Brutus.
Yes, they were both involved in the assassination of Julius Caesar.
Yes, another brother-in-law of Brutus was Publius Clodius Pulcher, the brother of his wife's father.
Yes, Cassius was a close friend and ally of Brutus. Their relationship played a significant role in Brutus' life, especially in his political and military endeavours.








































