Tiberius Gemellus

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 the Emperor Tiberius, and the cousin of the Emperor Caligula. Gemellus is a nickname meaning "the twin". His twin brother, Tiberius Claudius Caesar Germanicus II Gemellus, died in early childhood in 23 AD.