|Their first appearance|
If Infogalactic is to be believed, and I see no reason not to, they and the city of Lankhmar were named in 1934 by Leiber's friend, Harry Otto Fischer (a fellow author who actually wrote a Grey Mouser story published in The Dragon, Issue #18 and there goes my resolution not to mention D&D while discussing this book). Leiber would have been 24 at the time. The last story in the series, The Mouser Goes Below, was published in 1988. That means Leiber spent fifty-two years writing about these two characters. That's a lot of mileage to get out of fantasy's original buddy-cop pairing.
A couple of other bits ripped from Infogalactic for your enjoyment:
- Bazarre of the Bizarre, chapter 10 of the collection we're reading from, is one of Leiber's three favorite stories
- A sex scene from The Swords of Lankhmar, cut by editor Don Wollheim ("Good Heaven, Fritz, we're a family publisher...") was published in Fantasy Newsletter #49 (July 1982).
- The characters were loosely modeled upon Leiber himself and his friend Harry Otto Fischer.