Plato "tripartite soul" predates Freud's three-part mind. It consists of the appetitive (id), spirited (superego), and rational (ego) parts. In The Republic, he claims the perfect government reflects the human soul, being made up of three parts:
The masses, merchants and laborers, are the appetitive/id. They have a free market, always seek to satisfy their personal desires, and want as much freedom as possible.
The Military is the spirited/superego, and seeks to maintain order and the rule of law.
The government, which in Plato's ideal republic would be a group of philosopher-kings who aren't allowed to own any wealth, are the rational/ego. They command the other two groups and maintain balance between the masses' wish for freedom and the military's wish for order.
The command of the Army of Northern Virginia, at least through Chancellorsville:
Robert E. Lee: overall commander, principled but basically realistic, provided balance between Jackson and Longstreet. (Ego)
Thomas J. "Stonewall" Jackson: imaginative, risk-taking, bold, passionate. (Id)
James Longstreet: highly principled, the voice of logic and reason. (Superego)
Winston Churchill: Like Bones, impulsive and romantic, too easily giving in to his own desires (he was of course a notorious drunk). (Id)
Joseph Stalin: Like Spock, cold and calculating, noted for personal discipline (paranoid personal discipline, but discipline). (Superego).
Franklin D. Roosevelt: Like Kirk, eternally mediating between the two, knowing full well the risks of falling in either direction (fall to Winston, start war with Joe. Fall to Joe, lose Europe). (Ego)
On the other hand, the Axis Powers provide a fine example of a dysfunctional, even neurotic, relationship:
Fascist Italy: Provides the template for the Fascist mindset yet they are not as warmongering as Hitler or the Japanese, a little more rational with rejecting Hitler's genocidal methods and the Japanese ideal of Honor, but had a poor performance in the war, which forced them to ally with the Allies at the last minute (a weakened Ego)
The leaders in Paris1919 were also dysfunctional, but not as much:
Georges Clemenceau: Ambitious, feisty, and more than a little bit vindictive. This last bit gave him an intense and personal desire to see Germany pay. (Id)
Woodrow Wilson: Emphatically moral to the point of being puritanical, as well as being very cold and logical (he was not only a college professor, but he was part of the movement that tried to make political science as much like a science as possible). He insisted that the world comply with his moral conception of order, and didn't think much of anyone who disagreed. (Superego)
David Lloyd George: Trying to mediate between the two. He want to punish Germany but not take vengeance; was OK with the League but didn't think it was workable; he thought self-determination was nice-seeming but that concessions had to be made to power politics; and he was consistently frustrated both by Clemenceau's vengeful scheming and Wilson's sermons. Unlike most in his position, he was overshadowed; as he put it, he was sitting between Napoleon (Clemenceau) and Jesus Christ (Wilson), so no wonder the agreement was so dysfunctional. (Ego)
The legislature represents the will of the people. (Id)
The judiciary: Guilty or not guilty? (Superego)
The executive is the primary decision maker, they have to balance ideals and strategic objectives with the situation at hand, and they have to fulfill the desires of the legislature while still being under the criticizing eyes of the judiciary (Ego)
Could depend on your viewpoint, but if you were to take the three most well known cities in the United States, you'd have Los Angeles (Id), New York (Ego) and Chicago (Superego).
The three members of Rush: Neil Peart is the Superego, Geddy Lee is the Ego, and Alex Lifeson is the Id. Geddy also displays some Id tendencies but is overall more of an Ego than Alex.
