Does anyone know?

does anyone know what happens during the 1,000 year spand of time til the battle of ruusan?

cause we all know after the battle the rule of 2 came about and what not but what was goin on the 1,000 years before that battle?

Actually, that is an EU error; George Lucas has made it clear that the rule of two is thousands of years old.

Yes, but that doesn't mean people listened to it ( Revan, Malak, Sidious).

Are you kidding? Sidious definitely listens to it.

To quote:
"It is also revealed that Palpatine trained a number of Dark Jedi agents, many of which were held in reserve on Byss and played a role in Operation Shadow Hand after the Emperor died at Endor. Additionally, the Emperor had several secret agents known as "Emperor's Hands," notable examples being Mara Jade and Shira Brie (who later became Lumiya, Dark Lady of the Sith). Each agent was under the delusion that he or she performed a unique role as the only Emperor's Hand. There was also the Inquisitorius, a small and secret branch of Imperial Intelligence composed of Dark Jedi who assisted Darth Vader in hunting down surviving Jedi, and the Emperor's Secret Order of the Prophets of the Dark Side, a shadowy organization of dark side mages who foretold the future and quietly served throughout the galaxy as the Emperor's hands, eyes, voice, and reach. Several Dark Side adepts served in administrative positions in the Empire. Even the members of the Emperor's Royal Guard were all trained in rudimentary Force skills."