One of the Bhāradvājas.
His interview with the Buddha is described above, in the Asurinda Sutta.
He was the third of the Bhāradvāja brothers, all of whom eventually became followers of the Buddha (MA.ii.808).
"The name (demon-chief) is so pagan for a Brahmin" says Mrs. Rhys Davids (KS.i.203,n.2), and "the Buddha's reply so suggestive of Sakka's (in Samyutta i.221) that a bifurcated or transferred legend seems fairly plausible."