"But when a whole family, or some individual, happens to be so preeminent in excellence as to surpass all others, then it is just that they should be the royal family and supreme over all, or that this one citizen should be king."(1288a15-20) The key to Aristotle's quote is hidden in his definition of excellence. In Aristotle's context excellence refers to the excellence of a citizen "relative to the constitution of which he is a member." (III: 4, 30-32) A state is defined by its constitution. The salvation of the state's constitution is the common interest of every citizen of that state. A citizen's excellence therefore is measured by his ability to