Leia becomes a Sith apprentice

After the true nature of the Galactic Empire became clear, three of the most influential Imperial Senators, Bail Organa of Alderaan, Mon Mothma of Chandrila, and Garm Bel Iblis of Corellia, along with numerous others began plotting a secret resistance against the Galactic Empire. However, their plans were doomed to fail. In 10 BBY, Darth Vader learned Organa's "daughter", Princess Leia Organa, was actually his daughter. With the Emperor's permission, Vader installed a Imperial governor on Alderaan, making Queen Breha Organa a puppet, took Leia and began training her in the Sith ways, and tortured and executed Organa.