Oh really? Interesting. Something else I found:
The character of Darth Ruin was created by George Lucas as part of the backstory for the prequel trilogy. In Lucas's notes, Ruin is an unnamed Jedi Knight who fell to the dark side with fifty followers 2,000 years prior to the film saga, founding the Sith. Since the Sith have been well established in other C-canon works for thousands of years, this "foundation" was degraded to be only a schism, after three previous ones. All other information on him was created by Abel G. Peņa. ~ Wookieepedia, Darth Ruin.
So I guess that's what Sidious must have been referring to...