If any citizen of the United States shall accept, claim, receive, or retain any title of nobility or honor, or shall, without the consent of congress, accept and retain any present, pension, office, or emolument of any kind whatever from any emperor, king, prince, or foreign power, such person shall cease to be a citizen of the United States, and shall be incapable of holding any office of trust or profit under them, or either of them.
-Article XIII TONA from published 1825 U.S. Constitution (Military Laws)
