Who was Bruce Wayne's primary martial arts trainer? (e.g. a person who took a guy who was able to fight as well or worse as an average human fighter, and turned him into a guy able to defeat numerous opponents hand to hand in the same combat).
In Nolan's films, it's Ra's al Ghul (in the guise of Henri Ducard, who seems to be a separate character in comics).
I'd prefer an answer which spans all main continuities (initial Batman, pre-crisis, post-crisis, New52, and any non-comics and smaller where the answer is different as well).