Марк Клавдий Марцелл: Племянник Августа и возможный наследник империи.

Nephew of Roman emperor Augustus

Marcus Claudius Marcellus (42–23 BC) was the eldest son of Gaius Claudius Marcellus and Octavia Minor, sister of Augustus (then known as Octavian). He was Augustus' nephew and closest male relative, and began to enjoy an accelerated political career as a result. He was educated with his cousin Tiberius and traveled with him to Hispania where they served under Augustus in the Cantabrian Wars. In 25 BC he returned to Rome where he married his cousin Julia, who was the emperor's daughter. Marcellus and Augustus' general Marcus Vipsanius Agrippa were the two popular choices as heir to the empire. According to Suetonius, this put Agrippa at odds with Marcellus, and is the reason why Agrippa traveled away from Rome to Mytilene in 23 BC. That year, an illness was spreading in Rome which afflicted both Augustus and Marcellus. Augustus caught it earlier in the year, while Marcellus caught it later, after the emperor had already recovered. The illness proved fatal and killed Marcellus at Baiae, in Campania, Italy. He would be the first member of the imperial family whose ashes were placed in the Mausoleum of Augustus. Despite dying at a young age, Marcellus' position led to his celebration by Sextus Propertius, as well as by Virgil in the Aeneid.

Marcellus was born into the Claudii Marcelli, a plebeian branch of the gens Claudia in 42 BC, the son of Gaius Claudius Marcellus and Octavia Minor. He had two full sisters named Claudia Marcella Major and Claudia Marcella Minor as well as two younger maternal half sisters named Antonia Major and Antonia Minor. His mother was the great niece of Julius Caesar and the sister of Octavian. Octavian would later become the first emperor of Rome and assume the name "Augustus". His father was consul in 50 BC and, despite his initial loyalty to Pompey, sided with Caesar during Caesar's Civil War in 49 BC. After his father's death in 40 BC his mother was married to Marc Antony when Antony and her brother were the most powerful men in the Roman world.

He was betrothed to Pompeia, the daughter of Sextus Pompey, in 39 BC at the peace of Misenum where Octavian and Sextus Pompey agreed to a truce. Marcellus never married Pompeia and she fled with her mother and father to Anatolia in 36 BC. Not much is known about his education except that he was taught philosophy by Nestor the Stoic alongside his cousin Tiberius who had moved into Octavia's house following the death of his father Tiberius Claudius Nero in 33 BC. He may also have received some education by Athenaeus Mechanicus, who was a Peripatetic philosopher. At the conclusion of the War of Actium, Antony was defeated by Octavian at the Battle of Actium in September 31 BC, for which Octavian was awarded a triple triumph. The triumph was held in Rome during which his chariot was preceded by Tiberius and Marcellus. Tiberius rode on the trace horse to the left while Marcellus rode on the more honorable trace horse to the right, though Tiberius led the older boys in the Lusus Troiae ("Trojan games") as part of the performances held at the Circus Maximus. Octavian also had money distributed to the children of Rome in Marcellus' name.

Augustus fell dangerously ill in 23 BC and did not expect to recover. The model of imperial succession suggested that the closest male relative would succeed, despite the fact that Marcellus had held no office and lacked military experience. His marriage to Augustus' daughter seemed to be a strong indicator, but Augustus seems to have planned his succession so that the strongest and most experienced member of his family would succeed. He gave his signet ring to his lifelong friend and general Marcus Vipsanius Agrippa, a sign that Agrippa would succeed him if he were to die. This probably angered Marcellus, who expected to be his heir, though Augustus may have meant for Agrippa to run the empire until Marcellus became more experienced leading armies. The consequences of giving the ring to Agrippa is not entirely clear and it began much political speculation in Rome. It was an indication that Rome would remain under Caesarian control even after the death of Augustus. Regardless, the emperor was soon restored to health by an Antonius Musa and began grooming Marcellus for the principate. Agrippa left Rome to supervise the eastern provinces as the political climate in Rome became heated. Agrippa's absence from Rome served to protect him from personal attacks and to remove some of the perceived repression from republican minded senators. Suetonius reports that Agrippa left Rome because of Augustus' preference for Marcellus. As the political drama developed in Rome, Marcellus had developed a fever. Musa treated his illness the same way he had treated Augustus, using cold baths, but it was to no avail, and Marcellus died.

He was cremated and his ashes were the first to be interred in the Mausoleum of Augustus on the Campus Martius beside the river Tiber. The Mausoleum became the family tomb for Rome's first monarchic family in five centuries. The new theater that was under construction at the foot of the Capitoline Hill was named the Theater of Marcellus by Augustus in his honor. The Theater is an impressive structure even today after centuries of reuse. Sextus Propertius wrote an epikedion for Marcellus (3.18) in which he criticizes Baiae, the place of his death, and elevates Marcellus to the level of Julius Caesar and his famous (alleged) ancestor Marcus Claudius Marcellus who fought in the Second Punic War.