Maker/Legends

The Maker, also known The One Who Creates, was a being often refered to in deity-like-terms by droids. Droids claim that the Maker was the being that created the first droid. It seems curious that new droids would possess knowledge of the Maker, leading to two conclusions: new droids were told by old droids, creating a chain, or droid manufacturers included knowledge of the Maker in droid programming to make them easier to control.

Behind the scenes
In a tribute to C-3PO's exclamation "Thank the Maker!", some Star Wars fans refer to George Lucas, creator of Star Wars, as "The Maker".

Source

 * Lucas, George. Star Wars: Episode IV - A New Hope. Twentieth-Century Fox Film Distribution: 1977.