Friedrich Nietzsche 
Thus Spoke Zarathustra 

The book chronicles the fictitious travels and speeches of Zarathustra. Zarathustra’s namesake was the founder of Zoroastrianism, usually known in English as Zoroaster. Nietzsche is clearly portraying a "new" or "different" Zarathustra, one who turns traditional morality on its head. He goes on to characterise "what the name of Zarathustra means in my mouth, the mouth of the first immoralist:" (Wikipedia)