Kanwas Scar was an Annalist of the Black Company. He was one of Croaker's immediate predecessors in the role. He and another Annalist, Miller Ladora, were notoriously lax in their duties. Not much about the Company during their tenures as Annalist was recorded except for what their successors reconstructed from oral tradition and the memories of survivors.
During Water Sleeps, Sleepy guesses that an anecdote shared by One-Eye must have taken place during the time of Miller Ladora or Kanwas Scar. Sleepy, an Annalist herself, did not recognize the story from any of the historical Annals: it was about Goblin participating in an embarrassing sapper operation at a burg in the southern continent called Tember.