Gaius Julius Caesar (20 BC – 21 February AD 4), most commonly known as
Gaius Caesar or
Caius Caesar, was the oldest son of
Marcus Vipsanius Agrippa and
Julia the Elder. He was born between 14 August and 13 September 20 BC or according to other sources on 23 September 20 BC. Originally named
Gaius Vipsanius Agrippa, when he was adopted by his maternal grandfather the
Roman emperor,
Augustus, of the
Julian gens, his name was accordingly changed to Gaius Julius Caesar.