Licinianus was a nobleman of the highest ancient birth. His birth name is unknown, however his birth name could have been Lucius Licinius Crassus Frugi Libo. By birth and adoption through his father, Licinianus was of the gens Licinia. According to the name, it appears he was adopted into the gens Calpurniua though the identity of his adoptive father is uncertain.
Licinianus’ maternal grandparents were both direct descendants of Pompeia Magna, the daughter of triumvir Pompey from third marriage to Mucia Tertia. His paternal grandfather was consul and governor Marcus Licinius Crassus Dives. Crassus Dives was the adoptive son of consul and general Marcus Licinius Crassus Dives, the grandson of triumvir Marcus Licinius Crassus. He was the last known direct descendant of the triumvir and was the last known direct descendant of the triumvir who bore his name. Little is known of Licinianus’ life prior to his adoption by the Roman Emperor Galba. He most probably was born and raised in Rome.
When the elderly Galba was choosing a young heir his consul, Titus Vinius, proposed Otho, but Galba disapproved of Otho's lax morals, believing he would be little better than his predecessor, Nero. Instead he chose Licinianus, on the advice of his Praetorian prefect, Cornelius Laco. Suetonius describes him as a ‘handsome, well-bred young man’. Licinianus had enjoyed an excellent reputation for his integrity, uprightness and morality. Galba had called Licinianus ‘my son‘ and he had singled out Licinianus from the crowd at one of his morning receptions. Galba appointed Licinianus as heir to his name, the Roman throne and his property. When Galba was about to adopt Licinianus, Galba led Licinianus to the camp of the Praetorian Guard, where Licinianus was formally and publicly adopted.
Otho had expected to be chosen. He was shocked and disappointed to hear about Galba‘s choice, Otho then decided to assassinate both men to become himself emperor. On January 15, Galba was hacked to death in the street by scores of soldiers. Vinius was also killed, despite shouting out that Otho had not ordered his death. Out of all the imperial bodyguards, only one centurion, Sempronius Densus, dared to stand against the assassins. Armed only with a dagger, he single-handedly confronted a large body of fully armed men and, by denouncing their mutiny and fighting them to the death, he bought Licinianus time to escape. Licinianus fled and hid in the temple of the Vestal Virgins.
There he should have been safe, but the assassins were in no mood to respect the sanctuary of the temple. He was discovered by two soldiers, Statius Murcus of the Praetorian Guard and Sulpicius Florus, a British auxiliary who had just been granted Roman citizenship by Galba. They dragged him outside and killed him. He was thirty-one years old.
Tacitus states that Otho "studied the victim's severed head with peculiar malevolence, as if his eyes could never drink their fill". Licinianus’ death was not enough; Otho also had Laco killed.
One hundred and twenty people tried to claim the credit for killing Galba and Licinianus, expecting to be rewarded, and to this end a list was made of their names. However, when Otho was deposed by Vitellius the new emperor found the list and ordered them all executed.
Licinianus had married a Roman woman called Verania, who came from a family of consular rank. Otho had afterwards surrendered Licinianus’ head to Verania, who had given Otho a large sum of money, to gain Licinianus’ head. Verania had buried Licinianus’ head together with his body. It appears that Verania and Licinianus had no children.