2. Tiberius Julius Caesar - He was the second emperor of Rome. Born in 42 BCE and the son of Tiberius Claudius Nero and Livia Drusilla. But when his mother married Augustus in 38 BCE Tiberius became his adopted son. At age 31, Tiberius, divorced his wife Vipsania Agrippina at his stepfather's insistence and married Julia the daughter of Augustus.