Agrippina was born in 14 BC to Marcus Vipsanius Agrippa and Julia the Elder, before their return to Rome in 13 BC. She had several siblings, including half-sisters Vipsania Agrippina, Vipsania Attica, Vipsania Marcella and Vipsania Marcellina (from her fathers marriages to Pomponia Caecilia Attica and Claudia Marcella Major); and four full siblings, with three brothers; Gaius, Lucius, and Postumus Agrippa (all were adopted by Augustus; Gaius and Lucius were adopted together following Lucius' birth in 17 BC; Postumus in AD 4), and a sister Julia the Younger.