(Ἰάμβλιχος), one of the phylarchs, or petty princes of the Arab tribe of the Emesenes. (Strab. xvi. p.753.) He was the son of Sampsicceramus, and is first mentioned by Cicero in a despatch, which he sent fiom Rome to Cilicia in B. C. 51, and in which he states that Iamblichus had sent him intelligence respecting the movements of the Parthians, and he speaks of him as well disposed to the republic. (Cic. Fam. 15.1.) In the war between Octavianus and Antony in B. C. 31, Iamblichus supported the cause of the latter; but after Cn. Domitius had gone over to Octavianus, Antony became suspicious of treachery, and accordingly put Iamblichus to death by torture, along with several others. (D. C. 1. 13.) It appears, moreover, that Antony's suspicions had been excited against Iamblichus by the charges of his own brother Alexander, who obtained the sovereignty after his brother's execution, but was shortly afterwards deprived of it by Octavianus, taken by the latter to Rome to grace his triumph, and then put to death. (Ibid. 51.2.) At a later period (B. C. 20), the son of Iamblichus, who bore the same name, obtained from Augustus the restoration of his father's dominions. (Ibid. 54.9.)