Tiberius (Latin: Tiberius Caesar Dīvī Augustī Fīlius Augustus; 16 November 42 BC – 16 March 37 AD) was a Roman Emperor from 14 AD to 37 AD. Born Tiberius Claudius Nero, a Claudian, Tiberius was the son of Tiberius Claudius Nero and Livia Drusilla. His mother divorced Nero and married Octavian, later known as Augustus, in 39 BC, making him a step-son of Octavian.

Tiberius would later marry Augustus' daughter (from his marriage to Scribonia), Julia the Elder, and even later be adopted by Augustus, by which act he officially became a Julian, bearing 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.

Tiberius was one of Rome's greatest generals; his conquest of Pannonia, Dalmatia, Raetia, and temporarily, parts of Germania, laid the foundations for the northern frontier. But he came to be remembered as a dark, reclusive, and sombre ruler who never really desired to be emperor; Pliny the Elder called him tristissimus hominum, "the gloomiest of men."

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