He set the precedent for every Roman emperor. Not only did he establish the seat itself, but he established the idea of total power, pater patriae, and, whether you agree with it or not, going from the leader of half of a split empire (between him and Marc Antony, who he brilliantly deposed) to the unquestioned "father of the country" in all respects, politically, religiously, socially, and otherwise, is pretty damn amazing. Napoleon got here based on his achievements in establishing a monarchical rule and doing so favorably to his subjects, and Octavian did the same to a much greater degree in the Roman Empire, which, no matter where your biases lie, is a much greater force in history than a dysfunctional French nation.
That and what ghug said.