^ I trust then this means you never watched "Batman: The Animated Series" where he was voiced by the great David Warner? Or read the great 70's Dennis O'Neil stories where he was first introduced? Along with the Joker, Ra's is Bruce's greatest enemy.
Never watched it, but like Kegg, never knew of Ra's before batman Begins. Don't remember if he was featured during the Batman Tv series with Adam West. But that was time ago since I watched that series (as I was never a reader ofcomic books)