Knights of the Old Republic was a video game series that primarily consisted of two Xbox games and an online MMORPG, but because the Expanded Universe was wiped away after Disney purchased the franchise, this period of Star Wars history (thousands of years before the movies) hasn’t been explored in official canon.
Back in April during Star Wars Celebration, Lucasfilm president Kathleen Kennedy said Knights of the Old Republic was being developed as “something to look at,” although it wasn’t clear if this would be for the movie or TV realm.