Upon this motion, our cavalry on the left fell upon Pompey’s right wing. Meanwhile the clashing of armor mingled with the shouts of combatants, and the groans of the dying and the wounded, terrified the new-raised soldiers. On this occasion, as Ennius says, “they fought hand to hand, foot to foot, and shield to shield;” but though the enemy fought with the utmost vigor, they were obliged to give ground, and retire toward the town. The battle was fought on the feast of Bacchus, and the Pompeians were entirely routed and put to flight; insomuch that not a man could have escaped, had they not sheltered themselves in the place whence they advanced to the charge.
– Julius Caesar, The Spanish War 31.8
In honour of his victory the senate passed all those decrees that I have mentioned, and further called him “Liberator,” entering it also in the records, and voted for a public temple of Libertas. Moreover, they now applied to him first and for the first time, as a kind of proper name, the title of imperator, no longer merely following the ancient custom by which others as well as Caesar had often been saluted as a result of their wars, nor even as those who received some independent command or other authority were called by this name, but giving him once for all the same title that is now granted to those who hold successively the supreme power.
– Cassius Dio, Roman History 43.44.1-3
This refers unambiguously to Caesar who, as is well-known, was the first to bring the cult of Liber Pater to Rome; thiasus stands for dances, the round dances of Liber, which means the Liberalia.
– Servius, commenting on Virgil’s Eclogues 5.29 which is about Daphnis, the inventor of the Bacchic triumph