Originally Posted by Kurgan
The Sith being a breakaway Jedi sect 1,000 years before TPM was also introduced in the TPM novel. Before that the EU had an entire backstory for the Sith that had to be retconned (Tales of the Jedi comics). All we know from TPM (that we didn't know before) is that they Sith were thought extinct for a millennium.
So were they just a blip as far as the Jedi were concerned. Did they both arise and become extinct 1000 years ago?