His name shows that he had passed by adoption from the gensMucia to the gens Licinia. Mucianus was sent by Claudius to Armenia with Gnaeus Domitius Corbulo. He was a suffect consul during the reign of Nero, most likely during the years 63 or 64. Mucianus served as governor of Syria in 67 AD, following the outbreak of the Jewish revolt during the previous year. The future emperor Vespasian had been sent on a special mission to Judaea in 66 AD to put down the revolt. Initially, Mucianus and Vespasian were poorly disposed towards one another, however the feud was resolved by the beginning of 69. After the death of Galba, Mucianus and Vespasian both swore allegiance to Otho, but when the civil warbroke out, Mucianus persuaded Vespasian to take up arms against Vitellius, who had seized the imperial throne. It was agreed that Vespasian should stay behind to settle affairs in the East, while Mucianus made his way through Asia Minor and Thrace to attack Vitellius. On his way there, he defeated a Dacian invasion of Moesia. Mucianus reached Rome the dayafter the death of Vitellius, finding Domitian, Vespasian's son, at head of affairs, but until the arrival of Vespasian the real master of Rome was Mucianus. Mucianus never wavered in his allegiance to Vespasian, whose favor he retained in spite of his arrogance. He is mentioned in the records of the Arval Brethren in the year 70; Mucianus may have been admitted following Vespasian's entrance to Rome, although Ronald Syme admits that he may have been co-opted in absentia by Galba. He was appointed consul for the third time in 72. As no mention is made of Mucianus during the reigns of Titus or Domitian, he probably died during the reign of Vespasian; Syme believes his death happened before 78.
Writings
A clever writer and historian, Mucianus collected the speeches and letters of Romans of the older republican period, probably including a corpus of proceedings of the Senate. He was also the author of a memoir, chiefly dealing with the natural history and geography of the East, a text often quoted by Pliny as the source of miraculous occurrences.
