I have been told, albeit not part of the core, Haskell is not the first to the party and they most certainly have been monadic CL libs.

http://common-lisp.net/project/cl-monad-macros/monad-macros....

There are some people in the CL community who mention why CL users might not appreciate monads like those in other languages and/or programming styles/disciplines.

(Original) http://marijnhaverbeke.nl/monad.html

(HN Discussion) https://news.ycombinator.com/item?id=7651175