Lazarus of Bethany
The character Flint from the "" episode "Requiem for Methuselah" is a nearly-immortal man who was born in ancient Mesopotamia. His identities include Methuselah, Alexander the Great, Solomon, Lazarus of Bethany, Leonardo da Vinci and Johannes Brahms. Flint becomes lonely after living for a time on a deserted planet, and creates an immortal gynoid to keep him company. He eventually begins to slowly die because he left Earth's atmosphere, and dedicates the remainder of his days to the betterment of Mankind.