I recently found this posted on five iron frenzy's web forum and thought it was interesting, though I doubt it's true.
Alexander the Great was on one of his many military campaigns. As was typical, he would post sentinels around the perimiter of the camp, to report on any unusual activity (enemy incursions and the like). He was known to execute those who failed at their duties on the spot. One night, he was making the rounds and found a gaurd asleep at his post. He woke him up and said "What is your name?" and the young gaurd said "My name is Alexander." Taken aback, Alexander the Great said "Young man - change your character, or change your name."