Saul Tigh is a fictional character on Battlestar Galactica played by Michael Hogan. The character was named Paul Tigh in early scripts, and was renamed after a clerical error. Saul Tigh is a line officer assigned as executive officer on the Galactica.
At the opening of the series, he believes himself to be an ex-Colonial Viper pilot, the son of another pilot and the grandson of a Presidential military advisor, and to be around 70 years old. Memorabilia in his quarters suggest that he flew with a squadron named "Vigilantes". It is revealed during season four of the show Tigh's early memories are false, implanted by Brother Cavil when he killed and temporarily boxed Saul and his fellow Final Five Cylons.
Tigh is actually a survivor of the ill fated 13th tribe, a tribe made entirely of Humanoid Cylons. He is approximately 2000 years old, with his current body having been operational for about thirty years - any memories prior to that time are false. Tigh and the rest of the Final Five worked at the same research facility to rebuild resurrection technology lost since the Cylons started reproducing biologically.
Since the destruction of the Earth, he and his colleagues travelled to the 12 colonies, where the Cylon war was already in effect. There, they made a deal with the Centurions: stop the war and they would teach them how to make humanoid Cylons as well as resurrection technology, which eventually lead to the Five's memory wipe and placement in the colonies. He has struggled with alcoholism for much of his life, a problem that stems from Posttraumatic stress disorder connected to his false memories of the First Cylon War and his depression after he was mustered out of the fleet.
Despite this, he has excellent tactical skills and is fiercely loyal, especially to William Adama.