Antyllus was born and raised in Rome. His mother, Fulvia, died in October 40 BC, from illness, while in political exile in Sicyon, Greece. His father remarried to Octavia Minor, the second elder sister to Octavian (future Roman Emperor Caesar Augustus) who was a member of the Second Triumvirate. In his younger years, he was betrothed to Octavian's daughter Julia the Elder. After the alliance between his father and Octavian ended, the engagement was broken off. Between 40 - 36 BC, he lived with his father, step mother and his siblings in his father's mansion, in Athens, Greece. After 36 BC, he accompanied his father as they left Greece and lived his remaining years in Alexandria, Egypt in the court of Queen Cleopatra VII of Egypt.