16. Q. CASSIUS (LONGINUS) is mentioned without any cognomen; but as he is said to have been a legate of Q. Cassius Longinus [No. 15] in Spain in B. C. 48, he was probably a son of the latter. He seems to be the same as the Q. Cassius to whom Antony gave Spain in B. C. 44. (Hirt. B. Alex. 52, 57; Cic. Philipp. 3.10.)
A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890