[1] He was probably the eldest son of Lucius Cassius Longinus Ravilla, consul in 127 BC, who had presided over the trial of several Vestal Virgins who had been charged with unchastity.
As praetor in 111 BC, he was sent to Numidia to bring Jugurtha to Rome to testify in corruption trials, promising him safe passage.
He was assigned to Gaul to oppose the migration of a confederation of Germanic tribes (mainly Cimbri and Teutones).
[4] After his death, the remains of his army under Gaius Popillius Laenas passed under the yoke, gave up half of their belongings, and returned to Rome.
[5] The massacre of Longinus and his army was one of the reasons given by Julius Caesar in De Bello Gallico for why he denied the Helvetii the freedom to migrate through Roman territory in 58 BC.