Dual light sabers

when did it become so stylish for characters to wield 2 light sabers? Until Anakin did it in Ep2 had never occured in the movies, unless you count Maul and his double bladed saber. Don't recall mention of this in any of the books i've read, although i haven't read any of NJO. Seems to be more the domain of the comics and moreso recently.