So there it is, or as Suetonius might say, Res ipsa loquitur. Whatever the similarities, Mr. Trump certainly differs from “Little Boots” in one respect: Unlike the emperor, he hasn’t undergone a “momentous transformation.” The record indicates that he has always known he’s divine.As to how — on earth — we arrived at this point, here, perhaps, a note of consolation, in an earlier scene in “I, Claudius.” Caligula’s great-uncle Tiberius, another beauty of a Caesar, informs him: “I will make you my successor, Gaius Caligula. Rome deserves you.”