40. But Posidonius, in the third, and also in the twentieth book of his Histories, says--"The Celtæ sometimes have single combats at their entertainments. For being collected in arms, they go through the exercise, and make feints at, and sometimes they even go so far as to wound one another. And being irritated by this, if the bystanders do not stop them, they will proceed even to kill one another. But in olden times," he continues, "there was a custom that a hind quarter of pork was put on the table, and the bravest man took it; and if any one else laid claim to it, then the two rose up to fight till one of them was slain. And other men in the theatre having received some silver or gold money, and some even for a number of earthen vessels full of wine, having taken pledges that the gifts promised shall really be given, and having distributed them among their nearest connexions, have laid themselves down on doors with their faces upwards, and then allowed some bystander to cut their throats with a sword." And Euphorion the Chalcidian, in his Historical Memorials, writes as follows--"But among the Romans it is common for five minæ to be offered to any one who chooses to take it, to allow his head to be cut off with an axe, so that his heirs might receive the reward: and very often many have returned their names as willing, so that there has been a regular contest between them as to who had the best right to be beaten to death." 41. And Hermippus, in the first book of his treatise on Lawgivers, asserts that the Mantineans were the original inventors of men to fight in single combat, and that Demonax, one of their citizens, was the original suggestor of such a course; and that the Cyreneans were the next to follow their example. And Ephorus, in the sixth book of his History, says--"The Mantineans and Arcadians were in the habit of practising warlike exercises; and even to this day they call the military dress and the ancient fashion of arming the Mantinean, as having been invented by that people. And in addition to this, the exercises of single combat were first invented in Mantinea, Demeas being the original author of the invention. And that the custom of single combatants was an ancient one, Aristophanes shows, when he speaks thus in his Phœnissæ-- And on the heroes twain, the sons of Œdipus, Has savage Mars descended; and they now Seek the arena dread of single combat.