Nero Claudius Drusus
He was born at Rome to a prominent branch of the "gens Claudia", the son of Tiberius and his first wife, Vipsania Agrippina. His name at birth was Nero Claudius Drusus after his paternal uncle, Drusus the Elder. In AD 4, he assumed the name "Julius Caesar" following his father's adoption into the Julii by Augustus, and became Drusus Julius Caesar.