"The Reign of Tiberius-Out of the First Six Annals of Tacitus With His Account of Germany, and Life of Agricola" is a classic Roman history text. Tiberius (Tiberius Caesar Divi Augusti filius Augustus; 16 November 42 BC - 16 March 37 AD) was Roman emperor from 14 AD to 37 AD, succeeding the first emperor, Augustus. Born to Tiberius Claudius Nero and Livia Drusilla in a Claudian family, he was given the personal name Tiberius Claudius Nero. His mother divorced Nero and married Octavian-later to ascend the Empire as Augustus-who officially became his stepfather. Tiberius would later marry Augustus' daughter (from his marriage to Scribonia), Julia the Elder, and even later be adopted by Augustus. Through the adoption, he officially became a Julian, assuming the name Tiberius Julius Caesar. The subsequent emperors after Tiberius would continue this blended dynasty of both families for the following thirty years; historians have named it the Julio-Claudian dynasty. In relations to the other emperors of this dynasty, Tiberius was the stepson of Augustus, grand-uncle of Caligula, paternal uncle of Claudius, and great-grand uncle of Nero. His 22-and-a-half-year reign would be the longest after Augustus's until Antoninus Pius, who surpassed his reign by a few months in 161. Tiberius was one of the greatest Roman generals; his conquest of Pannonia, Dalmatia, Raetia, and temporarily, parts of Germania, laid the foundations for the northern frontier. Even so, he came to be remembered as a dark, reclusive and sombre ruler who never really desired to be emperor; Pliny the Elder called him "the gloomiest of men." After the death of his son Drusus Julius Caesar in 23 AD, Tiberius became more reclusive and aloof. In 26 AD he removed himself from Rome and left administration largely in the hands of his unscrupulous Praetorian prefects Lucius Aelius Sejanus and Quintus Naevius Sutorius Macro. When Tiberius died, he was succeeded by his grand-nephew and adopted grandson, Caligula. Tiberius was born in Rome on 16 November 42 BC to Tiberius Claudius Nero and Livia. In 39 BC his mother divorced his biological father and remarried Gaius Julius Caesar Octavianus shortly thereafter, while still pregnant with Tiberius Nero's son. In 38 BC his brother, Nero Claudius Drusus, was born. Little is recorded of Tiberius's early life. In 32 BC Tiberius, at the age of nine, delivered the eulogy for his biological father at the rostra.[8] In 29 BC, he rode in the triumphal chariot along with his adoptive father Octavian in celebration of the defeat of Antony and Cleopatra at Actium. In 23 BC Emperor Augustus became gravely ill and his possible death threatened to plunge the Roman world into chaos again. Historians generally agree that it is during this time that the question of Augustus' heir became most acute, and while Augustus had seemed to indicate that Agrippa and Marcellus would carry on his position in the event of his death, the ambiguity of succession became Augustus' chief problem. In response, a series of potential heirs seem to have been selected, among them Tiberius and his brother Drusus. In 24 BC, at the age of seventeen, Tiberius entered politics under Augustus' direction, receiving the position of quaestor, and was granted the right to stand for election as praetor and consul five years in advance of the age required by law. Similar provisions were made for Drusus.