These warnings, however, were of no avail, and on June 9th, A.D. 747, Abú Muslim displayed the black banner of the ‘Abbásids at Siqadanj, near Merv, which city he occupied a few months later. The triumphant advance of the armies of the Revolution towards Damascus recalls the celebrated campaign of Cæsar, when after crossing the Rubicon he marched on Rome. Nor is Abú Muslim, though a freedman of obscure parentage--he was certainly no Arab--unworthy to be compared with the great patrician. "He united," says Nöldeke, "with an agitator's adroitness and perfect unscrupulosity in the choice of means the energy and clear outlook of a general and statesman, and even of a monarch."[477] Grim, ruthless, disdaining the pleasures of ordinary men, he possessed the faculty in which Cæsar excelled of inspiring blind obedience and enthusiastic devotion. To complete the parallel, we may mention here that Abú Muslim was treacherously murdered by Manṣúr, the second Caliph of the House which he had raised to the throne, from motives exactly resembling those which Shakespeare has put in the mouth of Brutus-- "So Caesar may: Then, lest he may, prevent. And since the quarrel Will bear no colour for the thing he is, Fashion it thus: that what he is, augmented, Would run to these and these extremities; And therefore think him as a serpent's egg Which, hatched, would as his kind grow mischievous, And kill him in the shell." [Sidenote: Accession of Abu ’l-‘Abbás al-Saffáḥ.]