It is revealed during season four of the show Tigh's early memories are artificial, implanted by Brother Cavil when he killed and temporarily boxed Saul and his fellow Final Five Cylons. It is unclear if these memories were fabricated or taken from a human by Cavil. 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 last body having been operational since the first cylon war - any memories prior to that time are artificial. 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 original planet known as Earth, he and his colleagues traveled 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 led 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 artificial 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.