Bail Organa is a fictional male Alderaanian senator in the Star Wars series. The character was portrayed on screen by Jimmy Smits. His allegiance / loyalty is to The Old Republic. Senator Bail Organa comes from the planet of Alderaan who gives Leia Skywalker sanctuary when Leia's mother Padme Amidala dies in childbirth. Leia would later become Princess Leia. Bail never tells his adopted daughter that she is a twin.
Bail Organa was first seen in the star Wars II - Attack of the Clones and the final part of the prequels, Star Wars III - Revenge of the Sith. Compared to other characters such as Obi-Wan Kenobi, Sentator Bail Organas parts in the film are small. Although in the films, what happens to Bail after 'Star Wars III - Revenge of the Sith' was never explained in the movies until the release of Star Wars - Rogue One.
We seen at the end of the third film, Bail Organa with his wife craddling the newly born Leia Skywalker (yet, to be known as Leia Organa) on the ice capped mountains of Alderaan.
Bail Organa makes brief appearances throughout the film whilst he is on the Rebel Alliance base on the moon of Yavin IV. He is seen with Mon Mothma who is the leader of the Rebels. Bail Organa announces that he is going back to Alderaan to oversee the plan to get the Senate to know about the creation of the Death Star. This explains how the character is killed off and is not in the original series.