Marcellus and Tiberius either accompanied or followed Augustus to
Hispania during his campaigns against the
Cantabri and
Astures in the
Cantabrian Wars. During the second campaign in 25 BC, Marcellus and Tiberius were
military tribunes with special
aedile powers. After the second campaign, Augustus discharged some of his soldiers and allowed them to found the city of
Emerita Augusta in
Lusitania (now
Mérida,
Spain). For the soldiers still of military age, he held games under the direction of Marcellus and Tiberius. The campaigns were a way of introducing Marcellus and Tiberius to military life and, more importantly, to the soldiery. He and Tiberius then returned to Rome, probably in the spring of 25 BC. His political career saw acceleration by Augustus, and he was thought to be Augustus' preferred successor by many contemporaries. He was married to his cousin
Julia the Elder, who was Augustus' only daughter. The following year (24 BC) he was awarded extraordinary privileges by the Senate: • He was made equal in rank to
ex-praetors • He was given the right to stand for the aedileship in 23 BC • He was given the right to become consul ten years before the legal age
Tacitus writes that Marcellus was a member of the
college of pontiffs and a curule aedile.
A question of succession Augustus fell dangerously ill in 23 BC and did not expect to recover. The model of later 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. ==Post mortem==