served as tribune in Caesar's army during the African war. (Hirtius, Bell. Afr.
He is probably the same as the Q. Marcius Crispus, who is frequently mentioned by Cicero as a brave and experienced soldier. In B. C. 43, he was in Bithynia as proconsul, and when L. Murcus solicited his assistance against Bassus, Crispus came with his three legions to Syria. When C. Cassius came to the East, both Crispus and L. Murcus surrendered their legions to him. (Cic. in Pison. 23, Phil.
11.12, ad Fam.
12.11, 12, ad Brut.
2.5; Dion. Cass. 47.27 ; Appian. B. C. 3.77, 4.58 &c.)