They introduced the Mandalorians. And raped them. As in they gave Governor (or whatever) Vizsla a lightsaber. Three problems with that right away: 1. Mandalorians do not have an organized government 2. Mandalorians do not use lightsabers 3. VIZLA ****ING DIED BY JANGO'S HAND LONG BEFORE THE CLONE WARS
A character from Jango Fett's time who's dead appeared and used a light saber, except he's a Mandalorian, and Mando's don't use lightsabers as a main weapon. Oh did I mention his light saber was black and looked like a katana.