Tobar said:

The existence of the "True Sith" has caused some confusion with their placement in the canonical timeline of galactic chronology. When Star Wars: Knights of the Old Republic II: The Sith Lords was first released, the establishment of the Old Sith Empire was believed to have taken place circa 25,000 BBY. Additionally, the beginning of the "True Sith"'s existence was fixed as being approximately "tens of thousands of years" in the past. In 2005, however, the establishment of the Old Sith Empire was retconned to have happened around 6900 BBY, which presented a new divide in the historical placement of the two groups, and indeed in the very nature of the Sith themselves.

Later, it was discovered that, after the Sith King Adas died while driving the Rakata from Korriban in 27,700 BBY, the Sith species possessed the technology to relocate themselves to nearby planets, creating the region known as Sith Space and the earliest Sith Empire.

I know, Tobar, but thanks anyway. Where did you get all that from?