Septimius
Person
Civil War 3.104 supplies the first indexed source portrait: “Then, on learning of these proceedings, the king’s friends, who, on account of his youth, were in charge of the kingdom, whether moved by fear, as they afterwards gave out, lest Pompeius should seize on Alexandria and Egypt after tampering with the royal army, or because they despised his fortunes, according to the common rule that in misfortune friends …”
Named form in selected editions; identity established only to the extent of the cited context.
Civil War 3.104
Caesar
Then, on learning of these proceedings, the king’s friends, who, on account of his youth, were in charge of the kingdom, whether moved by fear, as they afterwards gave out, lest Pompeius should seize on Alexandria and Egypt after tampering with the royal army, or because they despised his fortunes, according to the common rule that in misfortune friends become enemies, gave in public a generous reply to his messengers and bade him visit the king, but themselves formed a secret plot, and sent Achillas, the king’s prefect, a man of singular audacity, and L. Septimius, a military tribune, to assassinate Pompeius. …