The Dark Lords of the Sith are acknowledged as the leaders of the Sith Order, and the most powerful Sith of their time. Only one Dark Lord existed at a time until the reign of Lord Kaan, at which point the title was bestowed upon all the leading Sith Lords of the Brotherhood of Darkness. Following destruction of the Sith during the Battle of Ruusan, the dark order was reformed by Darth Bane. Bane instituted the "Rule of Two," which decreed that at no point in time could their number be more than two: a Master and an apprentice. Despite their difference in power, rank, and skill, both bore the title "Dark Lord of the Sith."
