Naga Sadow isn't in the databank but I did find this...
"about 5,000 standard years before the Battle of Yavin, the Republic discovered the Sith empire. An ambitious Dark Lord of the Sith named Naga Sadow decided he could conquer the vast Republic and began the Great Hyperspace War. His armies were defeated by the Jedi Knights. Other outbreaks of warfare between Jedi and Sith, and among the Sith themselves, took place over the next thousand years".