There are several references, by classical writers, to this blood-friendship, or to this blood-covenanting, in connection with Catiline’s conspiracy against the Roman Republic. Sallust, the historian of that conspiracy, says: “There were those at that time who said that Catiline, at this conference [with his accomplices] when he inducted them into the oath of partnership in crime, carried round in goblets human blood, mixed with wine; and that after all had tasted of it, with an imprecatory oath, as is men’s wont in solemn rites [in “_Sharb el ’Ahd_,”[105] as the Arabs would say] he opened to them his plans.”[106] Florus, a later Latin historian, describing this conspiracy, says: “There was added the pledge of the league,--human blood,--which they drank as it was borne round to them in goblets.”[107] And yet later, Tertullian suggests that it was their own blood, mingled with wine, of which the fellow-conspirators drank together. “Concerning the eating of blood and other such tragic dishes,” he says, “you read (I do not know where), that blood drawn from the arms, and tasted by one another, was the method of making covenant among certain nations. I know not but that under Catiline such blood was tasted.”[108] In the Pitti Palace, in Florence, there is a famous painting of the conspiracy of Catiline, by Salvator Rosa; it is, indeed, Salvator Rosa’s masterpiece, in the line of historical painting. This painting represents the covenanting by blood. Two conspirators stand face to face, their right hands clasped above a votive altar. The bared right arm of each is incised, a little below the elbow. The blood is streaming from the arm of one, into a cup which he holds, with his left hand, to receive it; while the dripping arm of the other conspirator shows that his blood has already flowed into the commingling cup.[109] The uplifted hand of the daysman between the conspirators seems to indicate the imprecatory vows which the two are assuming, in the presence of the gods, and of the witnesses who stand about the altar. This is a clear indication of the traditional form of covenanting between Catiline and his fellow conspirators.