Julio-Claudian family tree

[1] In the Julio-Claudian dynasty of Roman emperors, the lineage of the Julii Caesares was separated from those of the Claudii up to Augustus' generation.

[1] This generation has also two female descendants very close to the centers of power by their marriages: Julia, the daughter of Gaius Julius Caesar II was married to seven-times consul Gaius Marius, while Julia, the daughter of Lucius Julius Caesar II was married to the two-times consul and Roman dictator Lucius Cornelius Sulla, who had successfully challenged Marius' power.

[2] The younger of Caesar's two sisters married Marcus Atius Balbus: they were ancestors of all the Julio-Claudian emperors, apart from Tiberius.

Mark Antony's mother Julia was the daughter of Lucius Julius Caesar: she was an ancestor of the last three emperors of the Julio-Claudian dynasty.

[4][5] By this time marriages with a political agenda among the powerful families were in full swing, however not yet between Julii Caesares and Claudii.

[1] Atia, the daughter of Julius Caesar's sister, married Gaius Octavius: they became the parents of the first emperor of the Julio-Claudian dynasty, then still called Octavianus.

Junia and Gaius granddaughter Domitia Longina married twice: 1) Lucius Aelius Lamia Plautius Aelianus and 2) Emperor Domitian of the Flavian dynasty.

Issue from Domitia Longina first marriage was Lucius Fundanius Lamia Aelianus[8] and Plautia, their children married into the Antonine dynasty.

Without son, Augustus had adopted his grandsons (by his only daughter Julia) Gaius, Lucius and Postumus, and his stepson Tiberius, in order to ensure an heir and successor.

Tiberius, a Claudius by birth had become one of the Julii Caesares by adoption: from this moment this first dynasty of Roman emperors was both Julian and Claudian.