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 buffoon. Macrinus had dreamed that the purple should be his, and was supported in his wish by the African astrologer Serapion, who was obliging enough to prophesy the speedy demise of Aurelius Antonine in Macrinus' favour.

Julia immediately sent dispatches containing the account of what was going forward to her son, who, as usual, was absent from the city. When these arrived in the camp, Caracalla was just mounting his chariot, and gave orders that the mail should be taken first to Macrinus, who would sift its contents and only bring what was necessary to the Emperor. Thus did Macrinus learn that his treachery was discovered and a death-sentence for real or supposed treason imminent, which unpleasant certainty he resolved to obviate without further delay. In a very few days he had discovered a discontented person willing to do his work, one Martialis, a centurion, whose brother, according to Herodian, had recently been executed for some military offence, or, in Dion's version, because he was angered at his own tardy promotion. These two discussed the matter and resolved on the extermination of their mutual grievance, Martialis to do the deed.

The opportunity came on the 8th April 217, when Caracalla was on a journey to visit the temple of the Moon at Charrae in Mesopotamia. By the way, he had occasion to dismount for purposes of natural relief, and withdrew somewhat from his staff, thus leaving himself unprotected. Martialis saw his opportunity. On the pretext of having been