"Number One" is the first of eight humanoid Cylon models created by the Final Five for the Centurions following the first Cylon war. The Final Five referred to him as John, and he was created in the image of Ellen Tigh's biological father, John. He should not be confused with William T. Riker, which is also called Number One
One of the Number Ones, prior to being discovered among the Fleet, posed as Brother Cavil, a member of the Colonial clergy. However, contrary to his assumed role, he did not share the other Cylons' religious beliefs and frequently mocked them.