In camp , Caesar welcome Marcus Junius Brutus , his unofficial stepson whose mother is Caesar 's lover , Servilia of the Junii . Later , at a party hosted by Servilia , Brutus confide to Pompey that the loss of the eagle have made Caesar unusually vulnerable as his men are on the brink of mutiny . On the road to Caesar 's camp in Gaul , Octavian is taken captive by brigands . For Caesar 's request , Atia instruct her daughter Octavia to marry Pompey by first divorcing her husband Glabius , despite Octavia 's protests that they are deeply in love . Atia then present Octavia to Pompey at a party and offer her for premarital relations , which Pompey take advantage of .