I guess the answer is we don't know, probably never will know, but he most likely wasn't, being Carthaginian, and does it really matter.
And what is this nonsense of one-drop theory? There is not one gene for being black, it is a whole set of genes that determine your appearance, some of which are dominant to others, eg black hair dominates over blond, but mostly they are neutral (including skin colour) and that's why you get a mixed appearance when two races interbreed.