Michael Tigh was a Humanoid Cylon and a member of the Thirteenth Tribe.
Born over 4,000 years ago before Fall of the Twelve Colonies, he served as the representative of his tribe in the Quorum of Thirteen, which was consistenly made up entirely of Humanoid Cylons.
After the Thirteenth Tribe's exodus from Kobol and the tribe's discovery of the Algae planet and later Earth, Tigh would later marry Pythia and have a son: Saul Tigh, who would later become a member of the legendary Final Five. He would also become leader of the tribe, for over 2,000 years before his son assumed leadership upon his death.