Star Wars: Who Trained Yoda?

thanks for this bit of trivia. i wonder if they'll ever make a movie about how the jedis and siths came into existence. that would be one very good prequel. i know i'll be watching something like that if it was ever made to a movie.

I have read online that Master Be-De Leister was the origin of all Jedi and he was the one who trained Yoda. He lived in harmony for a thousand years and started to develop a Jeckel-Hyde personality where he unknowingly created and trained the first Sith in his altered state. He went insane and killed himself with a tool called the GerberSaber.

http://www.starwars.com/databank/character/yoda/ The above is a link to the offical Star Wars website. Unfortunately it doesn't seem to say who trained Yoda, I think that's a bit like trying to find out who created God.