Caesar
Plutarch
Plutarch. Plutarch's Lives, Vol. VII. Perrin, Bernadotte, translator. Cambridge, MA: Harvard University Press; London: William Heinemann Ltd., 1919.
But Caesar sent to Labienus his money and his baggage; against Domitius, however, who was holding Corfinium with thirty cohorts under his command, he marched, and pitched his camp near by. Domitius, despairing of his enterprise, asked his physician, who was a slave, for a poison; and taking what was given him, drank it, intending to die.