“People know about you, Commander. Descendant of a watchman who believed that if a corrupted court will not behead an evil king, then the watchman should do it himself–”
“It was only one king,” Vimes protested. “It wasn’t a habit!”
“Sam Vimes once arrested me for treason,” said Vetinari calmly. “Sam Vimes once arrested a dragon. Sam Vimes stopped a war between nations by arresting two high commands. He’s an arresting fellow, Sam Vimes.”
All you ever need to know about Sam Vimes
Terry Pratchett, Thud!