Princess Leia Organa was born as twin sister the Luke Skywalker, bearing the name Leia Amidala Skywalker. The twins were children of the Jedi Knight Anakin Skywalker and Senator Padme Amidala, and both of them were force-sensitive. After her father fell to the dark side (eventually becoming Darth Vader), the siblings were separated which resulted in Leia being adopted by Senator Bail Organa and his wife, and raised as Leia Organa.
As an adult, she took over her father, Bail Organa's position in the Imperial Senate. Despite holding an important post within the Galactic Empire, Leia supported the ideology of a reform that would eventually lead to the birth of the Galactic Republic. She worked undercover with the Galactic Empire until she finally presented the plans of the Death Star to The Alliance, aiding in its destruction.
Leia was a part of a number of battles with The Alliance including the Battle of Hoth and the Battle of Endor. She was even given the title Huttslayer after she defeats and kills the Hutt crime boss, Jabba the Hutt. After the defeat of the Darth Vader and successfully overthrowing the Galactic Empire, Leia marries her lover Han Solo and they bear their first child Ben Solo. The birth of Ben Solo marked the end of the Galactic Civil War.
Her significance in the defeat of the Galactic Empire has her elected as a senator in the New Republic, aiming towards restoring the Jedi Order.