A member of the Plebeian gens Marcia, Crispus had possibly been elected to the office of Aedile by 58 BC.
[4] During this portion of the campaign, he was given the responsibility of attacking the town of Thabena, which he then garrisoned after taking it.
[6] Together, they cornered Bassus at Apamea, and were acclaimed Imperator by their troops by early 43 BC.
[8] Following this, he refused to serve under Cassius (unlike Statius Murcus), and temporarily retired from political life.
[9] It has been conjectured that Crispus was the Quintus Marcius who was appointed suffect consul in 36 BC.