Plutarch, Galba
Bernadotte Perrin, Ed.

27. The litter was upset at the place called Lacus Curtius, and there Galba tumbled out and lay in his corselet, while the soldiers ran up and struck at him. But he merely presented his neck to their swords, saying: ‘Do your work, if this is better for the Roman people."’ [2] So, then, after receiving many wounds in his legs and arms, he was slain, as most writers state, by a certain Camurius, of the fifteenth legion. Some, however, ascribe his death to Terentius, others to Lecanius, and others still to Fabius Fabulus, who, they say, cut off Galba's head and was carrying it wrapped in his cloak, since its baldness made it difficult to grasp; [3] then, since his companions would not suffer him to hide his deed of valour, but insisted on his displaying it to all eyes, he impaled on his spear and thrust on high the head of an aged man, who had been a temperate ruler, a high priest, and a consul, and ran with it, like a bacchanal,¹ whirling about often, and brandishing the spear all dripping with blood.

But Otho, as they say, when the head was brought to him, cried out: " ‘This is nothing, fellow-soldiers; show me the head of Piso.’ [4] And after a little it was brought to him; for the young man had been wounded and tried to escape, and a certain Murcus ran him down and slew him at the temple of Vesta. Vinius also was slain, and he admitted himself a party to the conspiracy against Galba by crying out that he was put to death contrary to the wishes of Otho. However, they cut off his head, and Laco's too, and brought them to Otho, of whom they demanded largess. [5] And as Archilochus says² that,

Only seven lay dead on the ground, where we trod their bodies under foot. But we who slew are a thousand,

so in this case, many who had no part in the murder smeared their hands and swords with blood and showed them to Otho, as they presented him with written petitions for largess. At any rate, a hundred and twenty were afterwards discovered by means of these petitions, all of whom were sought out and put to death by Vitellius. [6] Marius Celsus also came into the camp. There many denounced him for trying to persuade the soldiers to defend Galba, and the majority clamoured for his death, but Otho did not wish it; however, since he was afraid to oppose them, he said he would not put Celsus to death so quickly, since there were matters about which he must first question him. He therefore ordered that he be fettered and kept under guard, and handed over to those in whom he put most trust.