I'd give positive statements to all French Ninja's question. Yeah, subject is little known but based on MK's text
The Five Hundred Mighty Companions or Thereabouts of Ysgramor the Returned
Clever-men seems to be somesort of personal assistants of some people, maybe chieftains and such. Ofcourse that whole text seems to be written with tongue on cheek so i wouldn't draw too drastic conclusions based on it.