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Roman imperial dynasties
Julio-Claudian dynasty

Augustus Children    Natural - Julia the Elder    Adoptive - Gaius Caesar, Lucius Caesar, Agrippa Postumus, Tiberius Tiberius Children    Natural - Julius Caesar Drusus    Adoptive - Germanicus Caligula Children    Natural - Julia Drusilla    Adoptive - Tiberius Gemellus Claudius Children    Natural - Claudia Antonia, Claudia Octavia, Britannicus    Adoptive - Nero Nero Children    Natural - Claudia Augusta

Tiberius Julius Caesar Nero Gemellus, known as Tiberius Gemellus, (10 October AD 19–AD 37 or 38) was the son of Drusus and Livilla, the grandson of Tiberius, and the cousin of Gaius Caligula. Gemellus is a nickname meaning "the twin". His twin brother, Tiberius Claudius Caesar Germanicus II Gemellus, died in infancy in 23.

Gemellus' father Drusus died mysteriously when Gemellus was only four. It is believed that Drusus died at the hands of the Praetorian Prefect, Sejanus. His mother Livilla was put to death because she had been plotting with Sejanus to overthrow Tiberius, and also because she may have poisoned her husband.

Not much is known about Gemellus' life, as he was largely ignored by most of the Imperial family. So much so that one of the major landmarks of his youth, the toga virilis, wasn't celebrated until he was eighteen. The normal age to celebrate this was fourteen years.

At the age of twelve Gemellus was summoned to the island of Capri where Tiberius lived, along with his cousin Caligula. Tiberius made both Caligula and Gemellus joint-heirs, but it was clear that Tiberius favored Caligula over his own grandson. Livilla had been Sejanus' lover for a number of years before their deaths, and many figured that both Gemellus were really Sejanus' sons.

Tiberius died March 16, 37, and Caligula became Emperor. Caligula made Gemellus his adopted son not long afterwards, but ordered him killed in late 37 or early 38 for allegedly plotting against Caligula while the Emperor was ill.

Unfortunately, little has been written about Gemellus. Most of the information we know about him has been connected to material about Caligula.

Josephus, Antiquities of the Jews, XVIII ch.6, is invaluable.

• Roman Emperors-DIR Tiberius Gemellus