Darth Organius was the reigning Dark Lord of the Sith and Galactic Empress, reigning from her usurpation of power in 4 ABY until her death in 69 ABY. The daughter of Darth Vader by his wife, Padme Amidala, Organius had been born as Leia Skywalker. Because her father had fallen to the Dark Side of the Force, she and her twin brother, Luke (the future Darth Skyis), had been separated from eachother at a young age by Obi-Wan Kenobi, Yoda, and Bail Organa. Organius was adopted by Senator Organa and his wife, Queen Breha Organa of Alderaan. Her last name was changed to Organa and she was raised as a Princess of Alderaan for the first nine years of her life. In 10 BBY, Darth Vader discovered that the Princess of Alderaan was his daughter, his child by Padme, and with the Emperor's permission, he launched a major attack on Alderaan. Senator Organa was captured, tortured, and executed, while a Imperial governor was installed on Alderaan and Queen Breha Organa reduced to a Imperial puppet. Vader took Leia as his apprentice and bequeathed upon her the Sith name Darth Organius. Over the next seven years, he trained his daughter alongside his other secret Sith apprentice, Galen Marek (Starkiller). She became talented in the ways of the Dark Side. In 3 BBY, Organius completed her training and formally entered the Empire's service as a Adept. At this time also, Vader had discovered his son Luke on Tatooine and had taken him, killing the Lars family and defeating Obi-Wan Kenobi. He became Darth Skyis.
From 3 BBY onwards, Organius served the Empire, engaging in various missions. She tracked down and killed Olee Starstone, defeated various uprisings or rebellions in the Outer Rim, and helped her father slay the Dark Woman. She also revealed the location of Yoda to the Emperor. In 2 BBY, Marek betrayed Vader and organized the Alliance to Restore the Republic, having been converted to the light side by Rahm Kota. Organius confronted and killed Marek, but the Rebel leaders, who had been captured by the Empire, managed to flee imprisonment. Thereafter, Organius led campaigns against the Rebels. Despite her efforts, the Death Star was still destroyed by the Rebellion at Yavin. Organius thereafter served under her father, exposing and destroying the Rebel base on Hoth. A year later, she instigated a coup against Vader and the Emperor, overthrowing them and seizing control of the Empire. Organius then destroyed the final remnants of the Rebellion. During her 64-year reign, the Empress vastly expanded and strengthened the Empire. She annexed Hutt Space, the remaining Allied States, and the Hapan Consortium, waged wars against the Chiss, Vagaari, and Ssi-ruuk, and averted the Yuuzhan Vong threat. Organius also completed the construction of the Second Death Star and vastly expanded the New Sith Order.