5 years ago
I don't know how much of it is canon anymore, but yeah, the Rule of Two came about after Bane became the sole Sith survivor of the Jedi-Sith War about 1000 years before the Clone Wars. I had to laugh, though. Literally three pages after I posted this update Darth Plagueis muses about how the Rule of Two had expired and "Precious few Sith Lords had honored it, in any case".
On a side note, you never need to disparage any Star Wars knowledge you may have internalized, and you especially don't need to do it when addressing someone who goes by Darth and has a My Little Pony in a Vader costume as their avi. Just saying. :)